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，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.
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