訓 もと,もとい ・ 音 キ
Sino-Vietnamese: cơ
Earth 土 gives the meaning and 其 the sound: the solid ground under a building, so it means foundation (Han Viet co, as in co ban = basic).
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まず基本を勉強しましょう。 (まずきほんをべんきょうしましょう)
Let us study the basics first.