传统的冲压喷气发动机使用液体燃料并与大气中的空气混合燃烧，以提供高速飞行的推力。
Ramjet engines have traditionally used liquid fuel which is mixed with atmospheric air and burned to provide thrust for high-speed flight.
航天飞机的发动机和耐热瓷砖防止其再重返大气层时被烧坏，但是维护成本也很昂贵，而分配不同承包人的任务时又增加了开销。
The shuttle’s engines and the tiles that protect it from the heat of re-entry proved expensive to maintain, and divvying up work among different contractors added to the costs.
当你启动V - 8发动机时，只是通过压缩冲程驱动了两个气缸(1升)，但是如果是一个大气缸你必须要压缩4升。
When you start a V-8 engine, you are only driving two cylinders (1 liter) through their compression strokes, but with one big cylinder you would have to compress 4 liters instead.
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