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重点讲解：
1. remind sb. of sth. 使想起；使记起；提醒；
This reminds me of Christmas parties.
这让我想起圣诞聚会。
2. be clear about 完全了解的；明白的；清楚的；
It is important to be clear about what Chomsky is doing here.
很有必要搞清乔姆斯基在这儿干什么。
3. prevent sb. from doing sth. 阻止；制止；阻碍；
Nothing would prevent him from speaking out against injustice.
什么都不能阻止他鸣不平。
4. right now 现在；此时此刻；
He's not in the office right now.
他现在不在办公室。
n. 身份，一致，特征
