煞费苦心的英语: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; ...
煞费苦心的法语:se creuser la cervelle;se casser la tête;se mettre l'esprit à la torture;se donner beaucoup de mal~地寻找借口se creuser la cervelle pour trouver un prétexte