比賽跑的那一圈
兩個意思都停在同一個畫面上，差別只在誰在上面跑，以及美式英語把哪一種留給了這個字。
noun · B1
A prepared track that runners, cars, bikes, horses or other racers race on. It is usually a closed loop with a marked start and finish line.
賽道／跑道
核心畫面
Think of a loop drawn on the ground and then built: one surface, edges you must stay inside, a line where the race starts and ends. The racetrack is that loop itself. Whatever runs on it — feet, wheels or hooves — the ground is what the word names.
「racetrack」的畫面可以想成地上畫好、又真的鋪出來的一個圈。同一種路面，兩側有界線，起點和終點在同一條線上。…更多收起
「racetrack」的畫面可以想成地上畫好、又真的鋪出來的一個圈。同一種路面，兩側有界線，起點和終點在同一條線上。這個字指的就是那個圈本身。上面跑的是腳、輪子還是馬蹄，都不影響——它叫的是那塊地。From the word’s history
Wiktionary analyses it simply as race + track: the track that a race is run on.
來源資料直接說它由 race（比賽）加 track（路徑）組成。字面就是「比賽跑的那條路」，跟現在的意思幾乎沒有距離。
Wiktionary entry for racetrack (kaikki:3f6f69a190036ae4:394621712): "From race + track."
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