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/ʃeip/
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n. 形状
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• The shape of the island is triangular. 这个岛屿是三角形的。
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7
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define
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/diˈfain/
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vt. 确定……的界线；限定
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• The boundary between these two countries is not clearly defined yet. 这两个国家的疆界没有明确划定。
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• The powers of a judge are defined by law. 法官的许可权是由法律规定的。
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8
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triangle
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/ˈtraiæŋɡl/
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n. 三角（形）
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• He outlined the triangle in red. 他用红笔画出三角形。
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• How many triangles are there in this picture? 这张图里面有几个三角形？
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9
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three
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/θri:/
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num. 三
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• This chair has only three legs. 这把椅子只有三条腿。
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• A triangle has three sides. 一个三角形有三个边。
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• three o’clock 三点钟
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10
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line
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/line/
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