磨く， 研く， 琢く， みがく
1. to polish, to shine, to burnish, to scour, to scrub, to brush (teeth), to grind (e.g. a lens)
2. to refine (a skill, etc.), to improve, to hone, to polish (up), to cultivate (one's character)
抛光，擦亮，打磨，刷洗，刷牙，研磨（如透镜）；用洗面奶洗脸(轻轻地磨)；精进（某项技能等）、提升、磨砺、打磨、培养（品格）