名词
中文翻译：Unknown
同义词：
['peak', 'summit', 'peak point', 'apex']
例句：
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1. The vertex of the triangle is where the three sides meet.
三角形的顶点是三条边交汇的地方。
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2. Themountain's vertex was visible fromthe top of the hill.
山顶的山脊线从山上可以看得很清楚。
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3. Thevertex of the parabola isthe point where the curve touches the x-axis.
抛物线的顶点是曲线与x轴接触的点。