单词学习:complementary Adjective (形容词)
complementary
/ˌkɒmplɪˈmentri/
补充的;互补的;相配的
The online exercises are complementary to the textbook, as 顾老师 explained in class.
正如顾老师在课堂上解释的那样,这些在线练习是对教科书的补充。
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