题型分类:词汇题
选项分析:
词汇所在句子“They were thus the pioneers of mechanical engineering and served as examples and teachers to other branches of engineering.”译为“因此他们是机械工程的先驱,是工程学其它分支的典范和老师。” pioneer 先驱。
A选项 leaders 领导者;
B选项 opponents 反对者;
C选项 employers 雇佣者;
D选项 guardians 监护者。
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