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4321整枝法是,主蔓留( )片真叶摘心,保留上部3片真叶叶腋处长出的( )条子蔓,每条子蔓留( )片叶摘心。子蔓出3条孙蔓,孙蔓留( )片叶摘心。孙蔓出2条重孙蔓,重孙蔓留( )片叶摘心。

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三子蔓整枝法是,主蔓留( )片真叶摘心,保留上部( )片真叶叶腋处长出的( )条子蔓,每条子蔓留( )片叶摘心。子蔓上的孙蔓全部打掉。

It is estimated that the US economy will keep growing__________ asteadypacethisyear.

It is high time that we took effective measures to gainincreasing control __________ our own environment.

When you know how you can add value ________ people, you’ll know how to make money.

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