Rain falls because the clouds can no longer handle it's weight; just like tears fall, because the heart just cannot handle the pain.

雨水落下来是因为天空无法承受它的重量，眼泪掉下来是因为心再也无法承受那样的伤痛。

youdao

In his words, "my right eye is stinging like crazy" which really sucks because in space, tears "don't fall off of your eye... they kind of stay there."

用他的话说，我的右眼非常的刺痛真是糟透了，因为在太空中眼泪不会从眼睛里流出来，它们总是有一点留在那。

youdao

And your tears fall like raindrops all day long.

你的眼泪像雨点般终日滴落。

youdao