煞费苦心 [- - kǔ xīn]rack one's brains; bestow [give] great care upon [to]; cudgel one's brains; go through a lot of trouble; great pains have been taken to...; It takes great [a lot of] pain.; painstakingly; take great pains; with much ado:
•¶煞费苦心地寻找借口 cudgel one's brains to find an excuse
•¶ 为了管理好工厂，他可真是煞费苦心。 He took great pains to manage the factory well.