She brushed a finger along the under surface, along the edge, along the stem.

她用一根手指抚过下表面、边缘、茎干。

It takes place every night as trillions of organisms rise from the ocean's depths to enjoy the surface's rich resources under the cover of darkness.

这现象每晚都会发生，几兆的生物从海洋深处涌升，在黑暗的掩护之下享受表层的丰富资源。

The bottom, or under surface, which appears to those who view it below, is one even regular plate of adamant, shooting up to the height of about two hundred yards.

在下方观看的人看来，底部或下表面是一块规则的坚硬金属板，高达约 200 码。

Brehm saw the young of an African monkey (Cercopithecus) clinging to the under surface of their mother by their hands, and at the same time they hooked their little tails round that of their mother.

Brehm 看到一只非洲猴子 (Cercopithecus) 的幼崽用手紧贴在它们母亲的下表面， 同时它们的小尾巴勾住它们母亲的尾巴。