PHRASAL VERB 隔绝;封锁 To close something off means to separate it from other things or people so that they cannot go there. 隔绝;封锁
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Police closed off about 12 blocks of a major San Francisco thoroughfare for today's march. [VERB PREP. noun]
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。
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The old guard of leaders are closed off behind walls built of yesterday's ideology. [VERB PREP. noun (not pronoun)]
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。