科学家日前公布的一项研究结果显示，早在电钻和麻醉剂发明之前，早期人类就开始通过在牙齿上钻孔的方法来医治蛀牙。
Long before the invention of electric drills and anesthesia early humans drilled teeth to treat decay, according to research published Wednesday.
科学家日前公布的一项研究结果显示，早在电钻和麻醉剂发明之前，早期人类就开始通过在牙齿上钻孔的方法来医治蛀牙。
Long before the invention of electric drills and anesthesia early humans drilled teeth to treat decay, according to research published Wednesday.
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