完美星球（2021）

A third of the land receives less than 25cm of rain a year.
三分之一的土地每年的降雨量不到25厘米
Deserts are scarred by desiccating winds and baked by the sun.
沙漠被♥干♥燥的风刮得伤痕累累,被太阳烤得焦头烂额
But even weather as challenging as this can be perfect for the locals.
但即使是这样充满挑战的天气,对当地人来说也是完美的
As darkness falls in the coastal deserts of South Africa,
随着南非沿海沙漠的黑暗降临,
the dunes come alive
沙丘变得活跃起来
with the call of a surprising desert dweller.
伴随着一个令人惊讶的沙漠居民的呼唤
A rain frog.
雨蛙
Not what you'd expect in a place that gets just 7cm of rain a year.
在一个年降雨量只有7厘米的地方,这可不是你所期望的
To survive here,she has to avoid the heat of the day
为了在这里生存,她必须避开炎热的天气
buried in the sand.
埋在沙子里
But each night,she heads out
但每天晚上,她都会出去
on her hunt for moisture.
她在寻找水分
Short,stumpy legs and a plump body are ideal for digging
短而粗的腿和丰满的身体是挖掘的理想选择
but not so good for getting around.
但不太适合四处走动
She can't hop,so she waddles across the dunes.
她不会跳,所以她摇摇晃晃地穿过沙丘
The world's slowest steeplechaser.
世界上最慢的障碍赛跑选手
Obstacles are tackled with dogged perseverance.
用顽强的毅力克服困难
She can travel a whopping 38 metres a night.
她一晚上能走38米远
No mean feat when you're the same size and shape as a marshmallow.
当你和棉花糖一样大小和形状的时候,这可不是什么了不起的壮举
Termites.
白蚁
They are 75% water -
它们是75%的水-
a meal and a drink in one.
一餐一饮合一
But she's not the most agile predator.
但她不是最敏捷的捕食者
Maybe if they just came a little closer ?
如果他们再靠近一点？
Oh,dear.
哦,亲爱的
Perhaps if they stop moving ?
如果他们停止移♥动♥？
At last.
最后
But now she has another challenge.
但现在她面临另一个挑战
To swallow her food,she must squash in her eyeballs
要吞下食物,她必须用眼球挤压
to push it down her throat.
把它压进她的喉咙
Termites may be juicy,
白蚁可能多汁,
but they don't provide her with quite enough water to survive.
但是他们没有给她足够的水来生存
It rarely rains here,
这里很少下雨,
but coastal deserts do get another reliable source of moisture.
但是沿海沙漠确实有另一个可靠的水分来源
At night - cool,moist air is blown in from the ocean,
夜晚,凉爽潮湿的空气从海洋中吹来,
forming fog banks that shroud the desert in mist.
形成雾堤,把沙漠笼罩在雾中
It condenses on vegetation,wetting the sand beneath.
它凝结在植被上,湿润了下面的沙子
So it's here that she waits,absorbing moisture through her skin.
所以她就在这里等待,通过皮肤吸收水分
Rain frogs are so dependent on this water that they can only survive
雨蛙是如此依赖于水,他们只能生存
in places with at least 100 days of fog a year.
在每年至少有100天雾的地方
And on the foggiest nights,
在大雾弥漫的夜晚,
when other frogs have emerged onto the dunes,
当其他青蛙出现在沙丘上时,
she takes her opportunity to find love.
她抓住机会寻找爱情
Male rain frogs are smaller than the females,
雄性雨蛙比雌性小,
and his stubby legs make it hard to hold on
他的短粗的腿让他很难坚持住
so he glues himself onto her back.
所以他把自己粘在她的背上
Still locked in their embrace,
仍然被他们拥抱着,
the pair head back beneath the sand,where they'll lay their eggs,
两人回到沙子下面产卵,
safe from the heat of the desert sun.
远离沙漠阳光的灼热
But there's one desert that gets so cold
但是有一个沙漠变得很冷
that liquid water simply can't exist.
液态水根本不可能存在
Winter in Mongolia's Gobi Desert.
蒙古戈壁沙漠的冬天
40 degrees below freezing.
零下40度
One of the driest and most extreme environments in the world.
世界上最干燥最极端的环境之一
Most animals can't survive weather like this
大多数动物不能在这样的天气里生存
but there's one unique mammal
但是有一种独特的哺乳动物
that manages to eke out a living here.
在这里勉强维持生计
The Gobi is home to the last 1,000 wild Bactrian camels on Earth
戈壁是地球上最后1000头野生双峰驼的家园
surviving at the very edge of what's possible.
在可能的边缘生存
Even camels need moisture,
即使骆驼也需要水分,
but any water here is now frozen solid.
但这里的水现在都冻成了固体
It's down to the bull to find a solution.
要想找到一个解决办法就得靠公牛了
Setting off with his herd,
带着他的牛群出发,
his search could cover thousands of square miles.
他的搜索范围可达数千平方英里
Driving them forward,he can keep going for days on end.
推动他们前进,他可以连续几天继续前进
Herds come together from across their vast range
牛群从广阔的范围聚集在一起
all looking for the same thing.
都在找同一件事
These long-distance specialists can smell moisture from 30 miles away
这些长途专家能闻到30英里外的湿气
and they've picked up a scent.
他们发现了一种气味
Even in the Gobi,one of the driest places on Earth,
即使在戈壁,地球上最干燥的地方之一,
wind can provide a rare source of moisture.
风可以提供罕见的湿气来源
Snow is blown to this desert from Siberia.
雪是从西伯利亚吹到这个沙漠的
Where it settles is impossible to predict,
它在哪里定居是无法预测的,
and it may not last long.
可能不会持续太久
But for now,at least,this bull has found what he's been searching for.
但至少现在,这头公牛已经找到了他一直在寻找的东西
In the cold,dry air,
在寒冷干燥的空气中,
snow doesn't melt
雪不会融化
so it must be eaten.
所以一定要吃
The Gobi's windblown snow is a lifeline
戈壁的风雪是一条生命线
that will sustain his herd throughout the winter.
整个冬天都能养活他的牛群
Even in this most hostile of places,
即使在这个最敌对的地方,
weather still provides just enough for survival.
天气仍然只够生存
The largest,most unpredictable weather on the planet
地球上最大最难以预料的天气
starts far out at sea.
从遥远的海上开始
Hurricanes,typhoons and tropical cyclones
飓风、台风和热带气旋
are violent,short-lived megastorms.
是剧烈的,短暂的大风暴
But there's a far more reliable weather system
但是有一个更可靠的天气系统
that originates over the ocean
起源于海洋
one that is eagerly anticipated by all in its path.
在其发展道路上被所有人热切期待的人
Monsoons are seasonal winds that blow at the same time each year
季风是季节性的风,每年在同一时间吹
and they carry colossal amounts of water from the ocean to the land.
它们把大量的水从海洋带到陆地
Christmas Island.
圣诞岛
A remote speck of rock in the Indian Ocean.
印度洋上一块遥远的岩石
For the last four months,its forest interior has remained dry and dusty.
在过去的四个月里,它的森林内部一直保持干燥和多尘
Life here is waiting for change.
这里的生活在等待改变
In November,the first storms of the monsoon reach the island.
11月,季风的第一场风暴抵达该岛
They're a welcome relief for those that have suffered through the dry.
对于那些在干旱中受苦受难的人来说,它们是一种受欢迎的解脱
And they are vital for the island's most numerous residents.
它们对岛上最多的居民来说是至关重要的
The red crabs of Christmas Island.
圣诞岛上的红螃蟹
They've spent the dry season sheltering in damp burrows
他们在潮湿的洞穴里躲过了旱季
beneath the leaf litter.
在落叶层下面
Crabs breathe through gills that must be kept moist.
螃蟹通过必须保持湿润的鳃呼吸
So it's only with the return of the annual monsoon
所以只有在每年季风回归的时候
that these land crabs can finally emerge.
这些陆蟹最终会出现
With the humidity now high enough,
现在湿度够大了,
they can begin an epic trek to the coast.
他们可以开始史诗般的长途跋涉到海岸
Every red crab comes together from across the island,
每一只红螃蟹都来自岛的另一端,
and they do so in their millions.
他们以百万计
50 million,to be precise.
准确地说是5000万
They've come to release their eggs that can only develop in the ocean.
它们是来释放只能在海洋中发育的卵的
There's just one small problem.
只有一个小问题
They may be crabs
它们可能是螃蟹
but they can't swim.
但他们不会游泳
They're scared of the sea.
他们害怕大海
But they don't have a choice.
但他们别无选择
They must release their eggs on the highest tide.
它们必须在最高的潮水上产卵
Each carries around 100,000 eggs,
每个都有大约10万个鸡蛋,
so over just two or three nights,
所以就两三个晚上,
trillions are released into the ocean.
数以万亿计的二氧化碳被释放到海洋中
Though some are more successful than others.
尽管有些人比其他人更成功
Once their work is done,the crabs will return to the forest.
一旦他们的工作完成,螃蟹将返回森林
Then,four weeks later,
四周后,
on the next highest tide
在下一个高♥潮♥
having hatched out to sea,
孵化出海,
a new generation of red crabs returns to the same beach.
新一代红蟹回归同一海滩
In good years like this one,
在这样的好年景里,
countless millions arrive back on the shores of Christmas Island,
无数的人回到圣诞岛的海岸,
turning the beaches red.
把海滩变成红色
Like their parents,they also need moisture in the air to breathe.
像他们的父母一样,他们也需要空气中的水分来呼吸
So before the rains move on,
所以在下雨之前,