to polish
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毎朝、靴を磨いてから家を出る。
Every morning, I polish my shoes before leaving home.
語学力を磨くには継続的な練習が欠かせない。
To polish language ability, continuous practice is indispensable.
彼は現場経験を通して判断力を磨いてきた。
He has sharpened his judgment through field experience.