It has long been a mystery how enough matter can reach these cosmic gluttons to swell them to such large sizes.
这个问题已经成为一个疑团，怎么会有如此充足的物质能够送给这些宇宙中的贪食客，让它们膨胀到这样大的尺寸。
Say a company wants to reach young men. It might buy ads on the sports section of a large portal such as Yahoo!. But it will also be paying for the women who visit that page.
比方说一家以小伙子为目标的公司，它或许会在如雅虎这样的门户网站的体育版块投放广告，但它也要为访问这个页面的女人们买单。
The rotors of a pump or a blower can reach high rotational speed, and the utility model is used for different use conditions, such as large pumping amount.
使泵或鼓风机等转子能达到高转速，大抽量及用于不同的使用条件下。
Then the view is not large, to choose a pump, plus some oil purification measures, such as the Canadian cold trap, baffle, retaining the oil wells, but also in order to reach a dirty vacuum.
那末务求不宽大，能够取舍有油泵，加上一些防油净化措施，如加冷阱、障板、挡油阱等，也能达成肮脏真空务求。
It would be unusual for such a large meteorite to hit the Earth, as most objects burn up in the atmosphere and never reach the surface.
这种现象太不寻常了。那么大的一个陨石来撞击地球。因为大多数物体在大气层中就已经烧起来从来不会到地表再燃烧。
It would be unusual for such a large meteorite to hit the Earth, as most objects burn up in the atmosphere and never reach the surface.
这种现象太不寻常了。那么大的一个陨石来撞击地球。因为大多数物体在大气层中就已经烧起来从来不会到地表再燃烧。
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