继公认良久的冥卫一(卡戎)及最近观察到的尼克斯卫星和许德拉卫星之后，它成为围绕这颗遥远星球运行的第四个实体。
It becomes the fourth object known to be circling the distant world after the long-recognised Charon and recently observed Nix and Hydra satellites.
次照片是由安装在火星侦察轨道器上功能强大的HiRISE像机所拍摄，该探测器自2006年以来一直在环绕着这颗红色星球运行。
The picture was taken by the powerful HiRISE camera on board the Mars Reconnaissance Orbiter - a probe that has been circling the Red Planet since 2006.
我在故事中谈到开普勒，不是因为他解释了星球运行规律，而是因为他解释了光如何在透镜中发生折射。正是他首创了focus(焦点)这个词。
He comes into my little story here because it was he, in explaining not how planetary motion worked but how light bent through lenses, it was Kepler who coined the term focus.
我在故事中谈到开普勒，不是因为他解释了星球运行规律，而是因为他解释了光如何在透镜中发生折射。正是他首创了focus(焦点)这个词。
He comes into my little story here because it was he, in explaining not how planetary motion worked but how light bent through lenses, it was Kepler who coined the term focus.
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