研究人员发现，那些一年至少一次为牙齿做专业清洗和打磨的人，患上心脏病的风险降低了将近四分之一。
They found that those who have their teeth professionally cleaned and polished at least once a year cut their risk of a heart attack by nearly a quarter.
该公司声称蓝宝石的刀锋能保持锋利一年左右，之后将在十年内提供免费清洗与打磨。
The company claims the sapphire blades will stay sharp for about a year and offer complimentary cleaning and re-sharpening for an entire decade.
每个活塞都要拆下来并且打磨，每个螺母和垫圈都要清洗或更换，并且一个都不能少。
Each piston disassembled and polished, each nut and washer cleaned or replaced, accounted for.
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