He took great pains to play up to Joan's mother.他费了好大的心力去取悦琼的母亲。The awful effort involved in travel canceled out the possible pleasure she'd have.她为旅行所费的许多心力抵消了她可能得到的愉快。Riis devoted his life to improving conditions in urban slums.里斯为改善城市贫民窟的生活条件倾注了大量心力。