Think of an egg left in boiling water for ten minutes. It goes in with a soft, running middle and comes out solid all the way through, so you can slice it and nothing spills. Nothing was added to it; the heat and the time did all of it. That firm, closed middle is the picture the whole word is built on.
可以想成一顆蛋在滾水裡待了十分鐘：下鍋時裡面還是軟的、會流，撈起來已經整顆變實，切開也不會流出來。沒有加任何東西進去，是熱和時間把它變成這樣的。那個「裡面變硬、封起來了」的畫面，就是這個字所有意思的起點。
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