1. Why was the area closed off to all traffic?
    为什么断绝了该地区的一切交通？

1. close off

1. 隔离：close in 包围 | close off 隔离 | close on 接近

2. 封死：解围(踢开球门区)clear | 封死close off | 筑人墙set/line up a wall

3. 封死(传球路线)：close man-to-man紧逼人盯人防守 close marking盯人防守 | close off封死(传球路线) | close out迎前去接近(进攻者)

4. close off的反义词

4. 结清(帐务封闭(道路等)：The general ordered his soldiers to close in for the kill. 将军命令士兵们围追堵杀. | close off结清(帐务封闭(道路等): | Close off the account at once, please. 请马上结账.

1. 隔绝;封锁
    To close something off means to separate it from other things or people so that they cannot go there.

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    e.g. Police closed off about 12 blocks of a major San Francisco thoroughfare for today''s march...
           由于今天的示威游行，警方封锁了旧金山一条主干道上大约12个街区。
    e.g. The old guard of leaders are closed off behind walls built of yesterday''s ideology.
           领导人的老警卫们生活在用过去的意识形态筑成的高墙内，与世隔绝。

1. block off the passage through

    e.g. We shut off the valve

    Synonym: shut offblock off

2. isolate or separate

    e.g. She was shut off from the friends

    Synonym: shut off

3. stem the flow of

    e.g. shut off the gas when you leave for a vacation

    Synonym: shut off