She distrusted his motives for wanting to see her again.

　　她懷疑他想再見她一面是別有用心。

　　He acted from base motives.

　　他的行為動機(jī)卑鄙。

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

　　他努力了解這個(gè)年輕人的動機(jī)，但就是弄不清楚。

　　Their motives remain a mystery.

　　他們的動機(jī)仍然是個(gè)謎。

　　Her motives for helping are questionable.

　　她幫忙的動機(jī)令人生疑。