If something's traveling supersonically, you can see it coming, but you won't hear it at all until it's already passed you.
如果有东西以超音速飞行，你可以看到它过来了，但在它真正经过你身边之前，你根本听不到它的声音。
Supersonically
原声例句
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经济学人 Science and technology
Just as aviators of old sought to break the sound barrier and travel supersonically, the search is now on for reliable and controllable ways to travel " hypersonically" , generally defined as more than five times the speed of sound.
正如古代飞行员力图突破音障， 进行超音速飞行一样，现在人们也在寻找可靠、可控的“高超音速” 飞行方式，高超音速通常被定义为音速的五倍以上。
英语百科
Supersonic speed
![U.S. Navy F/A-18 approaching the sound barrier. The white cloud forms as a result of the supersonic expansion fans dropping the air temperature below the dew point.[1][2]](/uploads/202502/14/FA-18_Hornet_breaking_sound_barrier_(7_July_1999)_-_filtered1849.jpg)
Supersonic speed is a rate of travel of an object that exceeds the speed of sound (Mach 1). For objects traveling in dry air of a temperature of 20 °C (68 °F) at sea level, this speed is approximately 343 m/s, 1,125 ft/s, 768 mph, 667 knots, or 1,235 km/h. Speeds greater than five times the speed of sound (Mach 5) are often referred to as hypersonic. Flights during which only some parts of the air surrounding an object, such as the ends of rotor blades, reach supersonic speeds are called transonic. This occurs typically somewhere between Mach 0.8 and Mach 1.23.
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