The first plane hit the World Trade Center's north tower at 8:45, ripping through the building's skin and setting its upper floors ablaze.

第一架飞机于8:45撞击了世贸中心北楼。 飞机撕裂开这幢大厦后，在大厦上部燃起熊熊大火。

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A cargo plane crashed into a housing complex shortly after takeoff setting off a huge blaze.

一架货机起飞后不久就着了大火，坠毁在一片住宅域。

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And the general method for setting up bounds is pretty much the same as in the plane, just there is one more step.

一般确定积分限的方法，和平面的情况类似，只是多了一步。

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The good news, you can do much of your homework without ever setting foot on a plane--and it is not only cost-effective but also wise to do so.

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By using social tools and lightweight Web apps, travel companies have moved toward a model that lets consumers experience their trips before setting foot in a plane and use discovery rather than search to make their trip, their trip, not a trip.

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Traveling is about more than booking a plane ticket and setting off.

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