Our two countries are mutually complementary in economy.
我们两国的经济是互补的。
These two aims are not always mutually complementary: at times they conflict.
这两个目标不总是互补的：有时它们相互抵触。
Simply put, the on-line education and traditional classroom teaching should be mutually complementary.
简言之，网络教育和传统的课堂教育应该互补。(网络教育和课堂教育话题观点总结)。
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