球出去以後，動作還要走完
最看得見的一支，畫面就是揮拍或投球之後手臂繼續往前的那一段。
noun · B2
In sports such as tennis, golf, cricket or baseball, the way your arm and body keep moving in the same direction after you have already hit or thrown the ball.
順勢動作（隨揮）
核心畫面
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…更多收起
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."
Two branches
開了頭以後，把它做完
把揮拍的畫面搬到計畫上：簽名、宣布、答應，都只是「擊中球」的那一下；真正決定結果的，是後面那段有沒有走完。
noun · B2
The work that someone does after a plan, a promise or a project has been started, in order to carry it all the way to the end.
後續執行