Their groundless accusation is made with ulterior motives.
他们的无端攻击是别有用心的。
I have an ulterior motive in offering to help you.
我主动提出要帮助你是有私心的。
She must have some ulterior motive for being nice to me ─ what does she really want?
她对我这么好，一定别有用心——她到底想干什么呢？
Sheila had an ulterior motive for trying to help Stan
希拉想帮助斯坦是另有所图的。
She felt so free from ulterior motives.
她觉得已毫无言不由衷的必要了。