每天一个永续美好生活类视频
周四·亲子
片名：水循环
翻译：瑞塔 朴自然译制
“啊,下雨了”
“Ahhh, It's raining”
嘿！你可曾想过雨从何处而来？
Hey! Have you ever wondered where the rain comes from?”
或者云是怎样形成的？
Or how the clouds are formed?
噢，这就是水循环的意义所在。
Well, this is what the water cycle is all about.
让我们一起探索吧！
Come, let's explore!
来吧!
Zooming！
当阳光照耀江河和海洋时，
When the sun heats up the rivers and oceans,
水变成水蒸气，上升到空气中。
water becomes water vapour and it rises up in the air.
这个过程叫做蒸发。
This process is called evaporation.
这是水循环的第一步。
It is the first step of the water cycle.
你在家里也能够看到水蒸汽！
You too can see water vapour at home!
让你妈妈烧点水。
Just tell your mommy to heat some water.
在水被加热的过程中
And as the water gets heated,
你可以看到水蒸汽上升到空气中。
you'll be able to see the water vapour rising up in the air.
当水蒸汽上升到天空中之后，
When the water vapour reaches up in the sky,
它会变成小水滴。
it turns into tiny droplets of water.
这些水滴和其他气体以及尘埃颗粒聚集到一起，形成云朵。
These water droplets along with various gases and dust particles, come together to form clouds.
这一过程被称为冷凝。
This is known as condensation.
现在，拿一个冷的盖子盖在你加热水的容器上。
Now, hold a cold lid over the vessel in which you heated water.
当你隔一段时间打开盖子之后，
When you open the lid after sometime,
你可以看到盖子上有水滴。
you'll be able to see water droplets on the lid.
这就是凝结！
That's exactly what condensation is!
当云层变得很重，再也不能承载更多的雨滴时，
When the cloud becomes too heavy and it cannot hold any more water inside,
它爆裂开来，形成雨、
it bursts open to give out rain,
冰雹
hail
或雪。
or snow.
这一过程被称为降水。
This is known as precipitation.
在下雨的时候，海洋，湖泊和河流把雨水聚集起来。
As it rains, water gets collected in oceans, lakes and rivers.
雨水甚至还会渗入土壤，成为地下水。
It even seeps through the soil and becomes ground water.
因此，水循环是一个不断蒸发、
Thus water cycle is a continuous process of evaporation,
凝结
condensation
和降水的过程。
and precipitation.
趣事时间
TRIVIA TIME
你知道植物也会出汗吗？
Did you know that even plants sweat?
植物的出汗叫做蒸腾作用。
That's called transpiration.
这就是为什么在有更多树的地方，
That's why it rains more in places with more trees,
例如山坡和森林，会有更多的降雨。
like hill stations and forests.
有时候雪会直接变成水蒸气
Sometimes snow directly turns into water vapour
而不是融化成水。
without melting into water.
这一过程叫做升华。
That's called sublimation.
这种情况在天气比较寒冷的国家经常发生。
This happens a lot in cold countries.
哦，我现在得走了。
Oh, I need to run now.
又下雨了。
It's raining again.
这就是本期的全部内容，
So this is me zooming out,
下期将会播放更多有趣的科学事实。
tune in next time for more fun facts.
（毕）
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