One way to picture a milk round: early morning, one person, one fixed route. Left at the corner shop, up the hill, a bottle on every doorstep, in the same order as yesterday. Tomorrow the same line is walked again. The picture is not really about milk — it is about going through a set list, one stop after another, until the round is finished.
「milk round」可以想成這樣一個畫面：清晨，一個人，一條固定的路。轉角左轉，一路上坡，每家門口放一瓶牛奶，順序跟昨天一樣。明天再照同一條線走一次。重點其實不在牛奶。在於那個「照著名單一站一站走，走完就是一輪」的節奏。round 指的就是這一輪。