When fleming returned from the war , he began searching for the chemical he believed could treat infections.取自高中英语第三册unit 9 The little mould that could一文。老师说着句话错了，不知道错在哪里呢？
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When fleming returned from the war , he began searching for the chemical he believed could treat infections.个人认为错在了，chemical 后面少了个that/which，因为 he believed在这里是个插入语，插入语通常由如by the way, sb think, sb suppose等等担当，在句子中如果去掉的话并不影响语法结构。这句话的意思是“当弗莱明战后回家后，他开始了那种他认为可以治疗感染的药物的搜寻之路。”
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好啊