Think of two matching narrow beds standing side by side in one room, a small table between them. Each one holds a single , and the two are the same: same size, same shape, a pair. That matching pair is the picture the word starts from, and the size of one of those beds is what the word later points at on its own.
可以想成「一個房間裡並排的兩張一樣的窄床」，中間也許擺張小桌子。每張只睡一個人，兩張長得一模一樣，成雙成對。twin 這個字本來就是雙胞胎的意思，所以先看到的是這對床；而其中一張床的大小，後來就變成人家在講的那個尺寸。
登入就可以看每一支怎麼連回核心畫面。