Queuing
[经] 排队论
🗣️ 情景例句
Besides, reasonable quantities of marketing literature are supplied free of charge.
此外，我们还免费提供一定数量的营销资料。
I can't remember what John was doing yesterday afternoon.
我不能记得约翰昨天下午正在做的东西。
Are there any trees in the picture?
画里面有树吗？