但是阿瑟顿博士表示，设计人员发现仅仅通过带上耳朵防护罩或其他方法减少噪音是不够的。

But Dr Atherton said the designers found that just reducing the noise of the drill, by putting on ear defenders for example, was not enough.

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防护面屏的设计应该有对头顶部和下巴的保护，面屏侧面应延伸至耳朵的部位。

Face shields should have crown and chin protection and wrap around the face to the point of the ear.

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