踏脚的

Are good grades a stepping-stone to college?

好成绩是上大学石吗?

She looked on the governorship as a stepping-stone to the presidency.

她把州长之职当作进身总统职位石。

He found a secure foothold and pulled himself up.

他找到了一个稳固并爬了上去。

One of the pedals has come off my bicycle.

我那自行车板有一个已脱落了。