主动提出的

She definitely had an ulterior motive in offering to help.

她主提出帮忙, 肯定有不可告人的机。

When this method is applied to the spiral bevel gears of an airplane engine, the results show that it is more reasonable than TCA and the precontrol method.

提出了一种在计阶段就可保证锥轮具有预期加载接触性的主计方法，并将其用于某航空发机中央传锥轮的面综合。