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painstaking effort(or care)他费了3年的～才写成这本书。It took him three years of painstaking work to write this book./毕生的～life-time endeavor
cardiac blood; heart blood
英汉词典共收录311570条英汉翻译词条，基本覆盖所有常用英文单词的例句及中文翻译，是不可多得的英语学习材料。