真的放出來的煙
這一族就是核心畫面本身：戰場上、海面上故意放出的濃煙，用來換取一段看不見的時間。
noun · C1
A thick cloud of smoke made on purpose during a battle, so that the other side cannot see where the soldiers, ships or planes are.
煙幕
核心畫面
Picture a cloud of smoke that someone has let out on purpose. It stops nothing and hurts no one. It does exactly one job: while it hangs there, you cannot see what is on the other side of it — and whatever needed to happen unseen can happen. Both uses of smokescreen are that cloud.
可以想成一片有人故意放出來的煙。它擋不住任何東西，也傷不了人。它只做一件事：煙在那裡的時候，你看不見另一邊發生什麼，…更多收起
可以想成一片有人故意放出來的煙。它擋不住任何東西，也傷不了人。它只做一件事：煙在那裡的時候，你看不見另一邊發生什麼，而需要不被看見的事就能進行。smokescreen 的兩個意思，用的都是這片煙。From the word’s history
Wiktionary gives the word as smoke + screen — a screen made of smoke. The compound says what it does: it blocks the view, not the way.
Wiktionary 把它拆成 smoke（煙）加 screen（屏障），也就是「用煙做成的屏障」。這個組合已經把它的作用寫在字面上：擋的是視線，不是路。
Wiktionary entry for smokescreen (kaikki:3f6f69a190036ae4:1233039641): From smoke + screen.
Two branches
用話或動作放的煙
把同一片煙換成話語和動作：你看得很專心，但看的是煙，真正在做的事就在煙後面進行。這是意思上的延伸，字面組合本身沒有改變。
noun · C1
Something you say or do in order to hide what you are really planning or really doing, so that other people look at the wrong thing.
煙幕（掩飾）