Picture the very first big stone going into the ground before a building exists. Someone important sets it in place, the date is cut into its face, and then everything else is built on top of it. It stays at the bottom, out of sight, holding up what came later. Both uses of the phrase can be thought of as that one stone: the thing that went in first, and that the rest now stands on.
可以想成房子還沒蓋起來以前，放進地裡的第一塊大石頭。由一位有身分的人放下，石面上刻著日期，之後所有的東西都疊在它上面。它留在最底下、看不太到，卻撐著後來的一切。這個詞的兩個用法，都可以想成同一塊石頭：先進場的那一塊，也是別的東西現在站著的那一塊。
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