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apex
英/ˈeɪpɛks/
美/ˈeɪˌpɛks/
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01n.
顶, 尖端, 最高潮
the point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars
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the point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars