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聚集（vi.）：
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The rioters concentrated at the main square of the town. 暴乱分子聚集在城市的主要广场。
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The troops concentrated near the station. 军队集结在火车站附近。
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The crowds concentrated in the center of the town near the royal palace. 人群聚集在市中心皇宫附近。
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聚精会神，集中思想（vi.）：
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Please concentrate on the lesson. 请专心听课。
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He could not concentrate because the room was noisy. 他不能集中思想，因为屋里太吵。
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She couldn’t concentrate upon a book very long. 她聚精会神看书的时间不能太长。
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259 concerned
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concerned可用作表语，用在下面两种结构中：
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be concerned about (for) 关心：
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He was very concerned about (for) you. 他非常关心你。
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We are all concerned about (for) her safety. 我们都很关心她的安全。
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She was much concerned over the plight of the refugees. 她很关心难民的状况。
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be concerned with和……有关的：
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I am not concerned with that matter any longer. 我不再和这事有关。
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This chapter is concerned with space flight. 这一章是有关太空飞行的。
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The meeting was concerned with foreign trade. 这次会议和外贸有关。
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concerned还可单独作定语，放在名词后面，表示“有关的”：
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The man concerned was her husband. 有关的人是她的丈夫。
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We shall have to consult the other countries concerned. 我们得和其他有关国家磋商。
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它常和all，everyone，everybody这类词一起用：
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He urged all concerned to take an active part in the movement. 他敦促一切有关人士积极参与这个运动。
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This was good news to everyone concerned. 这对所有有关的人那是好消息。
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