有时天边有黑云，而且云片很厚，太阳出来，人眼还看不见。

Sometimes, with thick layers of dark clouds hanging in the sky, the sun was hardly visible to the naked eye.

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有时天边有黑云，而且云片很厚，太阳出来，人眼还看不见。

Sometimes there are dark clouds in the sky. When the clouds are thick, the human eye cannot see that the sun has already risen.

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太阳消失在一大片云后面。

The sun disappeared behind a bank of clouds.

《牛津词典》