名词
中文翻译：顶点
同义词：
['peak', 'summit', 'apex例句：1. The vertex of the mountain is where the sun first appears.（山顶是太阳第一次出现的地方。）']
例句：
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1. The vertex of the mountain is where the sun first appears.
山顶是太阳第一次出现的地方。
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2. The vertex of the triangle is its right angle.
三角形的顶点是它的直角。
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3. The vertex of the parabola is the point at which it opens up.
抛物线的顶点是它展开的地方。