Tra từ tried and tested - Từ điển Oxford Advanced Learner 8th

Từ điển Oxford Advanced Learner 8th

tried and tested ˌtried and ˈtested/ˈtrusted idiom (BrE) (NAmE ˌtried and ˈtrue)that you have used or relied on in the past successfully •a tried and tested method for solving the problem Main entry: ↑tried_idiom