What is the different between “tray” and “plate”?

说得更形象一点,plate是盘子,tray是托盘.
食物放在盘子里,盘子放在托盘上.

a plate is used to hold a dish, while a tray is used to hold plates. and sometimes "tray" is used to form some new words, such as ash-tray, or something like that.

plate往往指代金属制的盘子

tray特指盛装菜肴茶水的盘子

tray是托盘
plate是吃饭用的盘子

tray 是缸..例如dust tray 烟灰缸 plate 是盘子