1.被动语态的使用：We have paid attention to the environmental problem for a long time.→Environment problem has concerned us for a long time.
2.一句话里出现了两个分句的时候，强调的重心就会偏移到后面
The homegrown corn is sweet, but it is difficult to grow.
The homegrown corn is difficult to grow, but it is sweet.
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1.被动语态的使用：We have paid attention to the environmental problem for a long time.→Environment problem has concerned us for a long time.
2.一句话里出现了两个分句的时候，强调的重心就会偏移到后面
The homegrown corn is sweet, but it is difficult to grow.
The homegrown corn is difficult to grow, but it is sweet.