One way to hold this word: stand in front of a mirror and lift your right hand. The person in the glass lifts a hand too, and everything about them matches you — same height, same shirt, same movement at the same moment. Only one thing has changed: the hand they lifted is on the other side. That is the whole idea, and both meanings of the word live inside it. A mirror image is a perfect match with the sides swapped. Depending on what you are looking at, you may notice the matching part, or you may notice the swap.
這個詞的畫面可以想成你站在鏡子前抬起右手。鏡子裡的人也抬起手，而且處處跟你一樣——一樣高、一樣的衣服、一樣的時間點動作。只有一件事不同：他抬的那隻手在另外一邊。整個詞就是這件事，兩個意思都住在裡面。鏡像是「處處吻合，但左右互換」。看的東西不同，你注意到的那一半也會不同：有時候看見的是「怎麼那麼像」，有時候看見的是「剛好反過來」。
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