主动提出的

She definitely had an ulterior motive in offering to help.

她主动帮忙, 肯定有不可告人的动。

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.

了一种在初始设计阶段就可保证弧锥轮具有预期加载接触性的主动设计方法，并将其用于某航空发动中央传动弧锥轮的合。