propellers

螺旋辊

Any of various winged vehicles capable of flight, generally heavier than air and driven by jet engines or propellers. 飞机各种能够飞行的带翼交通工具，通常比空气重，用喷气式发动机或螺旋桨驱动

An airplane cannot fly out into space be cause it must have the air for its propellers to push against. 飞机不能飞入太空，因为飞机的螺旋桨如果没有空气的反推力推进，是飞不起来的。