mastering

noun

the act of making a master recording from which copies can be made
複製のもととなる原盤を作る行為
- he received a bill for mastering the concert and making 100 copies
  彼はコンサートのマスターレコードと百枚の複製作成の請求書を受け取った
becoming proficient in the use of something
何かを使用するのに長けるようになる

having mastery of
何かに熟達する
- his mastering the art of cooking took a long time
  彼は料理の技術を学ぶのに長い時間がかかった

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