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知识点：
1. pointless adj. 无意义的
例句：I've already made up my mind; it's pointless to argue with me. 我已下定了决心，再和我争论没什么意义了。
2. ignorant adj. 不知道的、无知的、愚昧的
例句：He was ignorant of the fact that the school was closed for the day. 他不知道今天学校不开门。
3. skim v. 浏览；略读
例句：She forgot to study, so she had to skim over her material five minutes before the test. 她忘了复习，所以不得不在考前五分钟把参考资料再浏览一下。
4. all the rage 风行一时；流行
例句：This new cell phone is all the rage right now. 这款手机是目前最流行的款式。
5. get one's hands on... 获得……；得到……
例句：I get my hands on the newest model of laptop. 我拿到最新款的笔记本了。
n. (水、气、电)流，趋势
adj. 流通的
