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Cloud
云
A cloud is a massive droplets in the sky.
云是天空中大量的小水滴。
When the sun heats up the Earth, water on the Earth evaporates and becomes a cloud.
地球受到太阳的烘烤时，地球上的水就会蒸发并凝结成云。
What happens if a cloud gets big and thick? It rains.
如果云变得又大又厚时会怎么样呢？就会下雨。
Thick clouds are darker than thin clouds.
浓云比薄云的颜色更暗。
So, the sky looks grey right before it rains.
因此，下雨之前天空总是灰蒙蒙的。
Can we grab a cloud? No, we can't.
我们可以抓住云吗？不能。
A cloud consists of water droplets, so we cannot grab a cloud at all.
云是由水滴组成的，我们根本就抓不住它。
When you touch it, all you can get is wet hands.
你手碰到它时就湿了。
