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international halley watch中文是什么意思

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用"international halley watch"造句"international halley watch"怎么读"international halley watch" in a sentence

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Halley's Comet, named after English astronomer Edmund Halley who first demonstrated its periodicity, returns to the vicinity of the Sun and Earth approximately every 76 years. Since comets are believed to be the most primordial objects in the solar system, their study is of great importance to planetary science.
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