https://www.youtube.com/watch?v=2IKo5gXdOTw https://forum.wordreference.com/threads/be-known-to-by.579094/ https://forum.wordreference.com/threads/the-name-is-known-by-to-many.4066638/ https://tw.forumosa.com/t/known-to-or-known-by/23273 https://www.usingenglish.com/forum/threads/known-to-vs-known-by.207876/ https://reurl.cc/Wx473Z https://www.taishukan.co.jp/item/blog/?p=620 -- Practice doesn't necessarily make perfect, but it makes permanent. Premature practice (practice beyond the learner's competence) or practice without error correction makes imperfection permanent. --

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