AANA J. 2021 Dec;89(6):463-464.
Pandemic, a rising earth temperature, flooding, fire seasons lengthening, tensions at borders worldwide, let alone the nuclear arsenals sitting at the ready, and now we have supersonic missiles that travel many timesthe speed of sound.
大流行病、地球温度上升、洪灾、火灾季节延长、世界各地的边境紧张局势，更不用说随时准备发射的核武库，现在我们还有以数倍声速飞行的超音速导弹。
