我的右脚趾撞到一块水面下的石头。

My right toe struck against a submerged rock.

《柯林斯英汉双解大词典》

有条鳄鱼就潜伏在水面下。

A crocodile was lurking just below the surface.

《牛津词典》

妈妈：水面下的水是不会结冰的。

Mother: the water under the lake will not freeze.

youdao

那条船沉在水面下。

The ship sank below the surface.

youdao

尝试保持你的头和躯干正好在水面下，只有很小的起伏波动。

Try to keep your head and torso right at the surface, with very little up-and-down-motion.

youdao

只是它们的每个眼睛有两个瞳孔，一个在水面上，一个在水面下。

But each eye has two pupils, one above water, one below.

youdao

只是它们的每个眼睛有两个瞳孔，一个在水面上，一个在水面下。

But each eye has two pupils, one above water, one below.

youdao