迄今为止所发现的454颗系外行星中,多颗都具有极近椭圆形的轨道,这意味着行星与它们的母星并不总保持相同距离。
Many of the 454 exoplanets discovered to date have highly elliptical orbits, meaning the planets are not always the same distance from their parent star.
蒴果椭圆形,卵球形,或者近球形;托杯纵向的8肋。
Capsule ellipsoid, ovoid, or subglobular ; hypanthium longitudinally 8-ribbed.
月亮绕地球运行轨道为椭圆形而非正圆。所以月亮绕地球运动的过程中,有时月亮会离地球近一些,而有的时候离地球远一些。
The moon's orbit is elliptical rather than perfectly circular, so as the moon moves around the Earth it is sometimes a little bit closer and sometimes a bit further away from us.
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