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PS: An awesome down-to-earth example of stable orbits are the hyperbolic funnels that you often see at museums or in shopping malls.
备注：一个非常棒且实际关于稳定轨道的例子是我们经常能够在博物馆或是购物中心看见的大型"漏斗"。
《TOFEL（无字幕版）》《托福学习视频》
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And the only reason the coins in the funnels (or satellites around the earth) eventually DO spiral in to their doom is because they lose energy to friction and thus shift down from one stable orbit to another, until eventually, their orbit coincides with the ground. Which is called crashing.
而且，这些漏斗中的钱币（或者类似地球周围的人造卫星），最终将进入"螺旋宿命"的唯一原因就是由于摩擦力造成动能损失，不断地从一个稳定的轨道移转到另一个趋向中心的轨道，最终，它们的轨道与中心相互重迭，然后发生也就是我们所谓的"坠毁"。
《TOFEL（无字幕版）》《托福学习视频》
双语例句
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Along the road, funnels of dark grey smoke rose from bombed villages.
沿那条公路，暗灰色烟成漏斗状从遭到轰炸的村庄里升起。
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All energy funnels, all becomes you.
所有的能源渠道，成为你的所有。
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They are big and shaped like funnels.
它们的耳朵大，形状像漏斗。
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The lifeboats and funnels were shrunk by 10%.
救生船和烟囱的大小缩减了10%。
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From between two hills a sudden wind funnels at me.
山谷间一阵骤风向我袭来。
近义词
n.
hoppers