have cudgeled one's brains;for all one's pains;have expended much care and thought on sth.;have given much thought to sth. ;
例句:
1、
He failed with the best of intentions to win the sympathy of his pupils.
他虽然用心良苦,想获得学生们的同情,结果还是失败了.
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2、
Others are preoccupied with not getting caught , or thinking of ways to catch someone else.
这位同伴可能是个用心良苦的母亲, 也可能是个不怀好意的孩子.
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3、
这个用心良苦的集团包括了秘鲁, 以及比巴西经常账户盈余还要多的智利.
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