Alien world could host liquid water if it has 50 percent cloud cover, study says.
研究表明，如果外星星球覆盖50%云层就可能拥有液态水。
The satellite also tracks the amount of cloud cover all over the world.
这个卫星还能测出全世界总的云量。
Fog and low cloud cover are expected this afternoon.
预计今天下午有雾和低空云层。
Determining global cloud cover over time is a major aspect of understanding climate change.
随时测定出全球云量的多少，是了解气候变化的一个主要角度。
59a cloud began to cover the sun slowly, wholly.
59一片云彩开始徐徐把太阳整个遮蔽起来。
Venus's cloud cover is a great reflector of sunlight.
金星的云层能够大量的反射阳光。
A cloud began to cover the sun slowly, shadowing the bay in deeper green.
一片云彩开始徐徐地把太阳整个儿遮住，海湾在阴影下变得越发浓绿了。
A cloud began to cover the sun slowly, shadowing the bay in deeper green.
一片云彩开始徐徐地把太阳整个儿遮住，海湾在阴影下变得越发浓绿了。
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