绞尽脑汁rack one's brain(zt)
I have racked my brain.我已经绞尽了脑汁。
词组rack one's brain,英文的解释是to cause great mental suffering,to torture brain by means of the rack.,即,用尽心思去思考事情,太用心了,好象饱受精神上的折磨。用汉语中的“绞尽脑汁”来形容正好。
http://sl.iciba.com/html/2007/0518/00/271582_1.htm
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