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。
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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.
Thoughthe matter is difficult, we must deal __________ it.