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| ⇒ понаслышке | |||
| know firsthand (bookworm); be no stranger to (He who was no stranger to Egypt. alemaster) | |||
| have first-hand knowledge (о чём-либо – of something: I have first-hand knowledge of these processes. ART Vancouver) | |||
| experience firsthand (he experienced his influence firsthand Olga Okuneva) | |||
| знать не понаслышке: 1 phrase in 1 subject |
| Cliche / convention | 1 |