重点讲解：
1. get a glimpse of 一瞥；扫视；
例句：From where they sat they could get a glimpse of the main stream.
从他们坐的地方就能看见主航道。
2. put on 穿；戴；涂；抹；
例句：He put on a thick sweater since it was cold in the morning.
早晨很冷，他穿上了一件厚毛衣。
3. close off 隔绝；封锁；
例句：The workmen closed off the street for repairs.
工人们将大街封锁进行翻修。
4. line up （使）（某一批人）排成行；（使）列队；
例句：All the competitors lined up at the start.
所有参赛运动员均在起点列队就位

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