Flexibility, NC coating, manual brushing coating.
刷涂性及柔韧性佳，硝基漆、手扫漆。
You might be a diehard manual toothbrush user, but if you're not brushing as long or as thoroughly as you used to for reasons ranging from injury to arthritis, consider switching.
你或许是一名顽固的人力牙刷使用者，但是如果你像以前一样长时间或完完全全地刷牙并因此而损伤牙齿甚至发炎，那么是时候你考虑下转换方式了。
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