motive可数吗

She distrusted his motives for wanting to see her again.

她怀疑他想再见她一面是别有用心。

He acted from base motives.

他的行为动机卑鄙。

He tried to get a fix on the young man's motives, but he just couldn't understand him.

他努力了解这个年轻人的动机，但就是弄不清楚。

Their motives remain a mystery.

他们的`动机仍然是个谜。

Her motives for helping are questionable.

她帮忙的动机令人生疑。