他费尽心思地对她好。

He was making a real effort to be nice to her.

内心强大之人不会费尽心思地逃避改变。

Mentally strong people don't try to avoid change.

四个被锁在牢房的孩子一直在费尽心思，琢磨怎么逃出去。

The four kids locked up in the cell had been thinking of ideas to get out.

许多公司发现，他们费尽心思培养出来的员工，往往带着培训的成果投奔了他们的对手。

Many companies found themselves training employees only for them to go on and sell their acquired skills to their rivals.