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重点讲解：
1. show off 炫耀；卖弄；表现自己；
例句：He had been showing off for her at the poker table.
牌桌上他一直在她面前表现自己。
2. for sure 无疑；肯定；
例句：One thing's for sure, Astbury's vocal style hasn't changed much over the years.
有一点可以肯定，阿斯特伯里的演唱风格多年来没怎么改变。
3. to a certain extent 在一定程度上；
例句：To a certain extent, I am in favor of your project.
从某种程度上说，我赞成你的方案。
4. as if 好像；仿佛；
例句：The house seemed muted, hushed as if it had been deserted.
房子里似乎悄然无声，安静得好像已经没人在住一样。
n. 相反，背面，失败，倒档
adj. 反面的
