tried and true
成語所屬單字tried
tried and true — 慣用語
1. the North American English version of "tried and tested"; describing something t
1.慣用語
釋義
（美式英語）經過考驗的；屢試不爽的
the North American English version of "tried and tested"; describing something that has proven to be dependable through long or frequent use.
例句
For many teachers, flashcards remain a tried-and-true tool for helping students learn new vocabulary.