Boeing decided to mount the engine further forward instead, making the plane less aerodynamically stable.

波音决定将引擎放到更前端的地方，因此飞机在空气动力性上缺乏稳定性。

The heat causes the compressed air to rapidly expand, bursting out of the exhaust and propelling the engine forward.

热量导致压缩空气迅速膨胀，从废气中喷出并推动发动机前进。