Well, what looked like tracer going past the door of the window.

好吧，看起来光弹从窗户旁边的门旁飞过。

But also tracer rounds being fired from multiple enemy aircraft guns.

但有来自多架敌机机枪的光弹被射出。

On the wings of the aircraft, we've got flares, which when we fire the flares, it burns and it emits a smoke.

飞机翼上装有光弹，一旦发射，光弹会燃烧并释放烟雾。