Picture a row of guns along a ship's side. They do not go off one after another. Someone gives a signal and every one in the same instant, so what reaches you is a single enormous sound made of many. Then quiet, and everyone waiting to see what comes next. Many at once, in one moment, loud enough to change the air — that is a useful way to hold every use of salvo.
From the word’s history
Wiktionary traces this salvo to Latin salve, hail, the ordinary Roman greeting, by way of salva, a salute or volley. Firing guns together began as a way of greeting and honouring someone, which is why the word still covers the ceremonial use as well as the battle one.
Wiktionary 說這個 salvo 來自拉丁文 salve（你好、平安），那是羅馬人見面的招呼語，中間經過 salva（致敬、齊放）。同時放砲本來就是一種問候和敬禮，所以這個字到今天還同時涵蓋典禮和戰場兩種場合。
Wiktionary, "salvo" (etymology 2)
登入就可以看每一支怎麼連回核心畫面。