nki.lang.vocab_fill],
      
      quizlet : {
        // 機
        "機会|きかい": "chance; opportunity",
        "自動販売機|じどうはんばいき": "vending machine",
        "機械|きかい": "machine",
        "機能|きのう": "function; feature",
        "飛行機|ひこうき": "airplane",
        // 適
        "適当|てきとう": "appropriate; suitable",
        "適量|てきりょう": "proper quantity; suitable amount",
        "最適|さいてき": "most suitable; optima