Piston - engined aircraft and turboprops have air compressors to maintain cabin pressure.

活塞发动机和涡桨发动机的飞机有压气机来控制客舱的压强.

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The last important piston - engined airliners , the Lockheed Constelation ( 1943 ) and the Douglas DC - 6 ( 1946 ), were basically similar.

权威的活塞发动机飞机LockheedCOCnstelation以及道格拉斯DC -6 在本质上来说是相似的.

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