1680s, "large log placed at the back of a fire," from back (adj.) + log (n.1). Figurative sense of "something stored up for later use" is first attested 1883, but this and the meaning "arrears of unfulfilled orders" (1932) might be from, or suggested by, log (n.2).
雙語例句
1. There is a backlog of repairs and maintenance in schools.
對各學校的修繕和維護工作積壓了一堆。
來自柯林斯例句
2. We are faced with a backlog of orders we can't deal with.