20. center ones attention on把某人的注意力集中在上 21. be certain of有把握, 一定 22. for certain of肯定地,有把握地 23. by chance偶然 24. for a change换换环境(花样等) 25. ch...
1. because of : because后接的是一个句子(主谓宾);because of 后一般直接跟名词。例如: ?Because of the increasing number of machine—and as we noted before, machines magnify human effort—then anyone using a machine can get a higher wage than anyone no...
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