One way to hold this word is to watch a tennis swing in slow motion. The ball is already gone, and the arm is still travelling forward. That last stretch of movement — after the important moment has passed — is what the word points at. Stop the arm early and the shot goes weak or crooked, which is why the part after the hit still counts as part of the hit.
可以想成把一次揮拍放慢來看。球已經飛出去了，手臂卻還在往前走。這個字指的就是最後那一段——關鍵的一下已經過去了，動作還沒完。手要是提早停住，球就會軟掉或歪掉。所以「打完之後」的那一段，其實還算在這一擊裡面。
From the word’s history
The noun comes straight from the phrasal verb follow through, meaning to carry something all the way to its end.
這個名詞是直接從動詞片語 follow through 來的，follow through 的意思是「一路做到底」，所以名詞抓的就是「繼續走完的那一段」。
Wiktionary entry supplied in packet (source_ref kaikki:3f6f69a190036ae4:1448025831:3645): "Deverbal from follow through."
登入就可以看每一支怎麼連回核心畫面。