Supersonic means faster than the speed of sound — about 1,235 km/h at sea level. A supersonic jet, supersonic flight, supersonic speed.

Supersonic meansSupersonic 的意思是 faster than the speed of sound比音速還快—— about 1,235 km/h at sea level在海平面大約是時速1,235公里。A supersonic jet像 a supersonic jet（超音速噴射機）、 supersonic flight supersonic flight（超音速飛行）、 supersonic speed supersonic speed（超音速）。

When an aircraft crosses that line it makes the loud bang people call a sonic boom, which is why supersonic passenger flights over land are mostly banned. It is a real technical term from aviation and physics, but it is easy enough that ordinary people use it happily.

When an aircraft crosses that line當飛機超過那個速度， it makes the loud bang people call a sonic boom會發出人們稱為 sonic boom（音爆）的巨響， which is why這就是為什麼 supersonic passenger flights over land are mostly banned飛越陸地上空的超音速客機大多被禁止。It is a real technical term from aviation and physics這是航空和物理學裡真正的專業用語， but it is easy enough that ordinary people use it happily但簡單到一般人也很自然地在用。

It also gets used loosely for "extremely fast" — "he ran off at supersonic speed" — which everyone understands as exaggeration.

It also gets used loosely for "extremely fast"這個字也會被隨意用來說「快到不行」—— "he ran off at supersonic speed"像 "he ran off at supersonic speed"（他用超音速的速度跑走了）—— which everyone understands as exaggeration大家都聽得出來這是誇張的說法。

There is a scale worth knowing: subsonic (slower than sound), supersonic (faster than sound), hypersonic (very much faster, roughly five times the speed of sound and up).

There is a scale worth knowing有一個分級值得知道： subsonic (slower than sound)subsonic（次音速，比音速慢）、 supersonic (faster than sound)supersonic（超音速，比音速快）、 hypersonic (very much faster, roughly five times the speed of sound and up)hypersonic（極音速，大概五倍音速以上，快得多）。

The word can be a noun too, meaning a supersonic aircraft, but that use is rare and mostly for specialists.

The word can be a noun too這個字也可以當名詞用， meaning a supersonic aircraft指「一架超音速飛機」， but that use is rare and mostly for specialists不過這種用法很少見，大多是專家在用。