Keep changing the dirty plates, especiallyafter serving dishes with sauces or bones. Change a new plate before serving anew dish.

服务员要注意勤换骨碟，特别是有汤汁的菜或是有骨的菜，应在客人每吃完一道要尝另一道菜时，必须先为客人换骨碟。

youdao

"To clear one's plate" means to pick up the dirty plate from the table and take it to the kitchen after someone has finished eating.

“清理盘子”意味着当某人吃完后，从桌子上把盘子收拾好然后把它拿到厨房去。

youdao

As I set my plate in the dirty-dishes carousel, I saw her in the food line.

我把盘子放到脏碟子的传送带上时，看见她在排队打饭。

youdao

She picked up a dirty plate and hurried back toward the kitchen.

NEWYORKER: Max at Sea

"Here we have power steering fluid, some diesel oil and some dirty old crankcase oil, " he says, creating a mess on a paper plate.

FORBES: Entrepreneurs