记住要保持锋利。

Remember to keep it sharp.

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虽然他可以保持锋利的牙齿，他很聪明，好奇的，和体贴。

While he can be sharp, he is clever, curious, and thoughtful.

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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.

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