One way to hold all three uses together: points taken out of live play, from the field itself, while the clock is still running. In each sport the phrase quietly marks off the scores that are handed to you after play has stopped. Football sets it against the short kick that follows a touchdown; basketball sets it against the free throw taken after a foul; rugby sets it against a kick awarded once the game has been halted. So the word field is doing real work here: the score came from open play, not from a stopped game.
可以用一個畫面把三個用法串起來：分數是在比賽還在跑的時候，從場上直接拿到的。每一種球類用這個詞，其實都在跟「停下來以後才給你的那種分」劃清界線。美式足球拿它對比達陣後的追加踢；籃球拿它對比犯規後的罰球；橄欖球拿它對比停錶後判給的踢。所以 field 這個字是有作用的：分數來自進行中的比賽，不是來自停下來的比賽。
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