dining room指家庭的餐厅
例：Mom is doing some housework in the dining room.
妈妈正在餐厅做一些家务活.
restaurant指饭店、餐馆
例：John is having a meal in the restaurant.
约翰正在饭店吃饭.
canteen指单位、学校的食堂
例：Our shool master always visit the canteen.
我们的校长经常来食堂视察.
希望你的英语越学越好哦~