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重点讲解：
1. at once 立即；马上；
例句：The audience at once greeted him warmly.
观众立即对他作出了热情的反应。
2. see sb. off 为…送行；送别；
例句：A large group had gathered on the quayside to see them off.
一大群人聚集在码头上，为他们送别。
3. in time for 及时；不迟；
例句：He got to the station just in time for his train.
他及时到达火车站赶上了火车。
4. start off 开始；出发；
例句：They will soon start off.
他们很快就要动身了。
n. 会议记录，(复数)分钟
