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concentrate有三重意思
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集中（vt.）：
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I tried to concentrate my attention upon my research. 我设法把注意力集中在我的研究工作上。
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Nearly all the industry of Argentina is concentrated in the capital. 阿根廷的工业几乎全部集中在首都。
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Many retirement villages are concentrated on Florida’s west coast. 许多退休人员的村子都集中在佛罗里达的西海岸。
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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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