以下为句子列表：
英文: But in the absence of modern metal tools the Neolithic drill of choice 9,000 years ago was a flint head, according to Roberto Macchiarelli, of the University of Poitiers in France.
中文: 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。
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英文: In the example of the pill bug, Thierry Rigaud and his collaborators at the University of Poitiers in France have shown that males prefer not to mate with feminized males.
中文: 至于鼠妇，法国波瓦提大学的黎哥与同事收集的资料，显示雄性比较不喜欢与变性来的雌性交配。
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