煞费苦心
- na.rack one's brains
- 网络take pains; take great pains; painstaking

煞费苦心
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
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