You can think of momentarily as one very short moment, about the length of a blink. The interesting part is where that moment gets placed. Lay it on top of an action and it says the action only lasted that long. Lay it between you and something coming and it says that is all the waiting there is. One moment, measured as length or forwards as delay.
momentarily 的畫面可以想成一個很短的瞬間，大概一眨眼那麼長。有趣的是，這個瞬間可以放在兩個不同的位置。放在事情身上，講的是它只持續這麼短。放在等待身上，講的是再過這麼一下下就會發生。同一個瞬間，一個往內量長度，一個往前量時間。
From the word’s history
Momentarily is momentary plus -ly, so the moment is built into the word itself; only its placement changes.
momentarily 由 momentary（一瞬間的）加上 -ly 構成，所以「瞬間」本來就在字裡面，變的只是這個瞬間被放在哪裡。
Wiktionary entry 'momentarily' (packet source_ref kaikki:3f6f69a190036ae4:885594411): 'From momentary + -ly.'
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