首先，阳光照射不到那么深的地方，所以它完全是黑暗的。

First of all, sunlight doesn't reach that far down so it's totally dark.

youdao

首先，阳光照射不到那么深的地方，所以它完全是黑暗的。

First of all, sunlight doesn't reach that far down so it's totally dark.

youdao