不管空中旅行的便利有多部不容置疑，你应该记住在你飞行的过程中，几百吨破坏性的温室气体被排放到大气中。
However convenient air travel undoubtedly is, you should remember that during your trip hundreds of tons of damaging greenhouse gases are pumped out into the atmosphere.
飞行，当然，是最快的方式，但是在你停留在空中的时候，你看不到任何东西，除了蓝天和白云。
To fly, of course, is the fastest way, but you can't see anything during your stay in the air but the blue sky and white clouds.
你可以让一架飞机飞行，你也可以打死一只停在你家食物上的“苍蝇”。
You can "fly" an airplane or you can hit a "fly" that is on your food in your house.
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