| 1. | Moving swiftly through the atmosphere, meteoroids are heated rapidly by friction .
流星体在快速穿过大气层时，因磨擦而迅速加热。
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| 2. | If the meteoroids are bunched together, the number of meteors seen varies from year to year .
如果流星体聚集在一起，则每年看到的流星数都不一样。
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| 3. | Others became asteroids , comets and smaller meteoroids
其他人成为了小行星彗星和更小的陨石。
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| 4. | Meteoroids are small particles in space with size similar to grains of sand
.宇宙充塞著沙粒大小的流星体。
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| 5. | Performance analysis for spacecraft shield structures against meteoroid and space debris
航天器微流星体及空间碎片防护结构性能分析
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| 6. | Countless meteoroids will be sent hurtling into the earth ' s atmosphere at 71 kilometres a second
无数流星将以每秒71公里的速度划破长空。
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| 7. | Life - bearing meteoroids and dust particles would be exposed to the vacuum of space , extremes in temperature and several different kinds of radiation
带有生命的流星体与尘粒，还会暴露在宇宙的真空、极端的温度与数种不同的辐射之下。
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| 8. | Most of the meteoroids of the leonid meteor stream concentrate in an elongated thin ribbon - like region . the stream orbits around the sun in an elliptical orbit with a period of about 33 years
狮子座流星群聚集于一条狭长的区域内，以极为椭圆形的轨道环绕太阳运行，周期约为
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| 9. | With the sun locating at the centre , our solar system is consisted of the eight planets and their satellites , dwarf planets , asteroids , comets , meteoroid and interplanetary matter
我们的太阳系，是以太阳为中心，由八大行星及其卫星矮行星小行星彗星流星体和行星际物质所构成的天体系统。
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| 10. | A " meteor shower " occurs when our home planet encounters a relatively dense region of meteoroids in space . an unusually large number of meteors can then be seen streaming from a certain point in the sky known as the " radiant "
许多流星像从星空中某一点称为辐射点向外散射而出，其实流星群飞向地球时大致是平行的，辐射点是视觉上的透视象。
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