An intervention could be, for example, to give some patients an electric toothbrush that helps them care for their mouths better, while other patients just get a regular toothbrush.

举例来说，干涉就是在一些病人用普通的牙刷时，给另一些病人一把电动牙刷，它能帮助他们更好地照顾他们的口腔。

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He has developed several prototypes of hand-cleaning devices that can be mounted on walls, as well as a portable, battery-operated model the size of a large electric toothbrush.

他发明了好几种洁手装置的原型机，这些机器可以悬挂在墙上，跟那种便携式的电动模型一样，大小相当于一支较大的电动牙刷。

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The first cordless rechargeable electric toothbrush was introduced by General Electric at the same time.

与此同时，通用电气公司推出了第一个可充电的电动牙刷。

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Instead, it would recharge like an electric toothbrush whenever the car is stacked.

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Wine salesman Robert Thorpe, 35 years old, last month had his Sonicare electric toothbrush delivered to an Amazon Locker in a grocery store in Manhattan instead of his typical apartment-building drop-off.

WSJ: Amazon's New Secret Weapon: Delivery Lockers

An electric toothbrush may help you brush more effectively.

CNN: Gingivitis