1. vertex angle:supplementary angles 补角 | vertex angle 顶角 | vertical angle 对顶角
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2. vertical angle:vertical 铅垂;垂直 | vertical angle 顶角 | vertically opposite angles 对顶角
3. apical angle:aphelion 远日点 | apical angle 顶角 | aplanat 消球差镜
4. 顶角的翻译
4. apex angle:apex 顶 | apex angle 顶角 | apex of the sun 太阳向点