fro

They travel to and fro between London and Paris.

他们奔走于伦敦和巴黎之间。

Wilkie watched the to and fro of their dancing.

威尔基看着他们地舞。

Pat rolled the trolley to and fro.

帕特着手车。

Those boats are prepared for waftage to and fro.

那些船舶是准备用运送货物的。

Another means of extracting DHEA is introduced,Extracting DHEA fro m the residue of sweet potato,namely,Dehydro epi androsterone.

介绍DHEA的另一种提方法,从红薯废料———薯渣中提DHEA,即去氢表雄酮。

In a huge sideways jumps called a grand jete, a skillful ballet dancer seems to float fro an impossible length of time.

在一种大幅度的侧身作（小）中，一个技艺精湛的芭蕾舞演员好像在空中可以停上一段让人难以置信的时间。