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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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260 concert—concerto
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这两个词只有一个字母之差，意思却不同。
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concert /ˈkɔnsət/表示“音乐会”：
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Come into town with me and hear a concert. 和我进城去听一场音乐会。
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concerto读作/kənˈtʃeətəu/或/kənˈtʃəːtəu/，表示“协奏曲”：
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There’s Beethoven’s Violin Concerto. 有贝多芬的小提琴协奏曲。
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