That is why passenger planes are equipped with oxygen masks.

所以客机装备了氧气面罩。

youdao

A passenger peering out of the window might not even see the other planes.

乘客往窗外看时，甚至可能看不到其他飞机。

youdao

A passenger peering out of the window might not even see the other planes.

乘客往窗外看时，甚至可能看不到其他飞机。

youdao