星云由发光的气体组成，其间夹杂暗色的尘埃。这种明暗相间的组成标示了银河系缓慢的漩涡运动。

Clouds of stars are glowing gas, with patches of darkening dust, mark the slow-changing spiral patterns of the Galaxy disk.

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牛顿也证明了漩涡能产生椭圆运动纯属偶然。

Newton also proved incidentally that a vortex could not generate elliptical motion.

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这么一来所有的运动就不可避免地会带来漩涡回路。

So it follows that all motion must inevitably take the form of circuit a vortex.

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