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重点讲解：
1. account for （数量或比例上）占；
Computers account for 5% of the country's commercial electricity consumption.
计算机占去该国商业用电的5%。
2. drive a wedge between 破坏…之间的关系；挑拨离间；
I started to feel Toby was driving a wedge between us.
我开始觉得托比在挑拨我们之间的关系。
3. all kinds of 各种类型的；五花八门的；
They sell all kinds of things.
他们出售各种各样的东西。
4. prior to 在…之前；先于；
Prior to his Japan trip, he went to New York.
在去日本之前，他去了纽约。
n. 选择权，可选物，优先购买权
v. 给予选
