One way to hold this compound: a closed bag held out at a fair, and a hand going in. You cannot see what is in there, you do not get to pick, and whatever your fingers close around is yours. Two separate ideas sit inside that one movement — the bag is full of different things, and you had no say in which one you got. Almost everything the phrase does later comes from pulling those two ideas apart and using one of them at a time.
可以把這個複合詞想成園遊會上的畫面：一個封起來的袋子舉在面前，一隻手伸進去。你看不到裡面，也不能挑，手抓到什麼就是什麼。這一個動作裡其實藏了兩件事。一是袋子裡東西很雜，二是你根本沒得選。這個詞後來的用法，多半就是把這兩件事拆開，一次只用其中一件。
登入就可以看每一支怎麼連回核心畫面。