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Four quarts constitute a gallon. 4夸脱构成1加仑。
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This constitutes a direct threat to them. 这构成对他们的直接威胁。
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compose也表示“构成”，但主要用于be composed of这个句型：
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Twelve men compose a jury. 12个人构（组）成1个陪审团。
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The instrument was composed of about two thousand parts. 这个仪器由两千左右个部件构成。
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The substance was composed of three ingredients. 这种物质由3种成分构成。
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make up也可表示同样意思，也主要用于be made up of这个句型：
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Women now make up two-fifths of the British labour force. 妇女构成英国劳动力的2/5。
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All substances are made up of molecules. 一切物质都由分子构成。
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This is made up of three different parts. 这是由3个不同部分构成的。
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258 concentrate
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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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