用他的杂交水稻种子,农民们种出的粮食比以前多了一倍。
Using his hybrid rice, farmers are producing harvests ______ ______ _______ ______ before.
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用他的杂交水稻种子,农民们种出的粮食比以前多了一倍。
Using his hybrid rice, farmers are producing harvests ______ ______ _______ ______ before.
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