A that somebody has already cut for you. Open the bag, take a piece, done: no knife, no crooked slices, no waiting. You can think of the word as standing for convenience that has been made so easy nobody has to think about it any more.
可以想成一條麵包已經替你切好了。袋子打開就有一片，不必找刀，也不會切歪。這個詞的畫面，比較像「方便到你完全不用花力氣」的那種現成。正因為這種方便太理所當然，後來才會有人把它拿來當比喻的起點。
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