Picture a small shop. On the shelves stand the things the owner always keeps ready, because those are the things the shop sells. That waiting-on-the-shelf stock is one way to hold this word: whatever you always have on hand, ready to bring out the moment it is needed. Move the shelves out of the shop and into a person, and the same picture still works — the questions a host always asks, the voice a singer always relies on.
可以想成一間小店的架子。架上長期擺著的東西，就是這間店隨時拿得出來賣的東西。stock-in-trade 的畫面就在這裡：你手邊常備、需要時馬上端得出來的那一批貨。把這個架子從店裡搬進一個人身上，畫面一樣成立——主持人每次都問的那個問題、歌手每次都靠的那把嗓子，都是他隨時拿得出來的存貨。
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