煞费苦心

煞费苦心 [shà fèi kǔ xīn]

1. ■ 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.