n.决定；自主；意志力

She offered to help us of her own volition. 她自愿提出要帮助我们。

She left entirely of her own volition. 她完全是自愿离开的。

I didn't ask him to go;he went of his own volition. 我没有要求他去，他是出于自愿的。

Such cloudy weather can wear people's volition. 这种阴阴的天气最是消磨人的意志。

How can ability make his volition firmer? 怎么样才能让自己的意志更坚强？

adj.意志的；凭意志的；有意志的