車上那顆備用的輪子
這就是核心畫面本身，字面的、實際存在的那一顆。
noun · B1
An extra wheel with a tyre on it that you keep in a car, so you can put it on if one of the other tyres is damaged or goes flat.
備胎（車上備用輪胎）
核心畫面
Picture a soft round ring that travels with you and does nothing. It sits in the boot of the car, under the floor, clean and unused, waiting for the one day it is needed. The shape is the memorable part: a ring, extra, carried around. Once that shape is in your head, you can see why English points the same words at a body.
可以想成一圈軟軟的、圓圓的東西，跟著你到處跑，平常什麼事都不做。它躺在後車廂的底板下面，乾乾淨淨，等著某一天派上用場…更多收起
可以想成一圈軟軟的、圓圓的東西，跟著你到處跑，平常什麼事都不做。它躺在後車廂的底板下面，乾乾淨淨，等著某一天派上用場。最好記的是那個形狀：一圈、多出來的、被帶著走。這個形狀一旦進到腦子裡，就看得懂英文為什麼把同一組字指向人的身體。Two branches
腰上那一圈
同樣的形狀換到人身上：一圈、多出來的、跟著你走。這是英文裡的玩笑用法，講的人多半在說自己。
noun · B2
A ring of fat around a person's waist. The word is a light joke, and speakers most often use it about themselves.
腰間的一圈肉