1、Sometimes likened to UFOs, lenticular clouds are usually created by gravity waves.
透鏡狀云彩很像UFO，它通常由引力波造成。

2、Galaxy clusters are the largest objects bound by gravity in the universe.
銀河系星云是宇宙中通過重力相連的最大的物體。

3、Draw a car and hurl it down a steep track, only powered by gravity and - obviously - red Bull.
畫了一輛汽車，投下來一個(gè)陡峭的軌道，只有動(dòng)力和重力-顯然-紅牛。

4、Particle size analysis. particle size analysis by gravity sedimentation. pipette method.
粒度分析。用重力沉降法的粒度分析。滴定管法。

5、B Well, when it goes from a to b, -mgh1 the work done by gravity is minus mgh1.
當(dāng)物體從A到，重力做的功為。

by gravity翻譯