Unlike a conventional jet engine that uses a rotating compressor to compress air into the engine for combustion , this one has no moving parts.

传统的喷气式引擎利用旋转压气机将空气压缩进入引擎来燃烧，而这架飞机却完全没有运动的部分。

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Unlike a rocket engine, the jet engine, as you know, is an "air breather".

正如你们所知道的，这种喷气发动机与火箭发动机不同：它是“空气喷气发动机”。

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Unlike a jet plane, the shuttle has a fragile heat shield that can be easily damaged by rain or lightening.

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And unlike the rest of us who are struggling to cope with the jet lag, United's players are being sympathetically eased into their visit.

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And unlike pilots at the scene, these remote observers are unaffected by the physical toil of flying a jet or the adrenalin rush of combat.

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