On the other hand, a comparatively warm body with a small surface gravity, like Earth's moon, is unable to hold even the heaviest gas and thus lacks an atmosphere.

另一方面，像地球的卫星这种相对温暖、表面引力较小的天体，它们连最重的气体也无法容纳，因此也没有大气层。

youdao

He passed his hand along the surface of his desk and examined his fingertips for dust.

他用手在他的大班台上抹着，然后盯着他的指尖，看上面是否有灰尘。

youdao

On the other hand, Europa's smooth, icy surface likely conceals an ocean of liquid water.

另一方面，木卫二光滑的冰层之下很可能掩藏着一个液态水的海洋。

youdao

Since then, scientists have been studying the ship and bringing to the surface many of the artifacts -- things made by hand -- that they have found.

VOA: special.2011.07.26

All right. So please raise your hand now if you think there'll be sufficient energy to eject electrons from the metal surface?

好的，如果你们认为,有足够的能量从金属表面,射出电子请举手？

麻省理工公开课 - 化学原理课程节选

At his encouragement, I skimmed my hand across the surface of the creek.

NEWYORKER: Reversal of Fortune

He knelt down and crawled from the switch rails to the frog of the crossover, sliding his hand along the running surface and the head of the rail and feeling for possible corrugations or dents, or burrs shaved off by the wheels of the locomotives.

NEWYORKER: Among Animals and Plants

Some stores still have 64 GB Surface Pros on hand as of February 10.

FORBES: Links 10 Feb: Microsoft's Surface Pro Sells Out: But How Many Did They Release?