翻译成英语 他吃饭前都漱一下口

He always rinses his mouth before every meal.

漱口我还真不知道怎么说

说刷牙的话可以这样说

He always brush his teeth before meals.

he gargles before every meals

第一 漱口不等于刷牙
第二 every后面不跟复数名词

He takes a gargle before every meal. 就可以了