have a perfect mastery of sth be really up to the mark be able to pass the stiffest test
have a perfect mastery of sth
be really up to the mark
過硬的用英文怎麼說
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英語詞典收錄了最新的漢英詞典和英漢詞典,總共有200多萬個詞條,詞庫仍在不斷更新中。