Two alligators rest their snouts on the water's surface.

两只鳄鱼把它们的大嘴栖息在水面上。

《柯林斯英汉双解大词典》

As a way of reconciling these two facts, scientists have hypothesized that nearly all of the oxygen being produced was taken up by iron on Earth's surface.

为了调和这两个事实，科学家们假设，几乎所有产生的氧气都被地球表面的铁吸收了。

youdao

The color changes are executed by two different kinds of cells in the octopus' skin, mainly by color cells on the skin's surface call chromatophores.

颜色的变化是由章鱼皮肤上的两种不同的细胞造成的，主要是皮肤表面的色素细胞。

youdao

According to the Local Co-ordination Committees (LCC), an opposition activist network, two surface-to-surface missiles landed in Darayya on Tuesday night.

BBC: Member of EU Syria delegation killed in Damascus suburb

It recommended using geometric lines of latitude and longitude to convey a three-dimensional Earth on a two-dimensional surface, and it included the co-ordinates of over 8, 000 locations in the ancient world.

ECONOMIST: There is no such thing as an objective map

Picture what it would be like to roll a bowling ball onto the two-dimensional surface of a trampoline.

NPR: Einstein: Relatively Speaking, a Complicated Life