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语法sos
1,Ludmilla Turkevich ,known as a (translator) and scholar (in the field) of Russian literature, she (became) a member of the faculty of Princeton University (during) the Second World War.
为什么became 错了???
2,In medicine , (certain )plastics have important (uses) because they (do not affected) by chemicals in the body ,and they (do not harm) the body.
为什么是(do not affected)错了
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