anesthesia

Studies in rodents and monkeys have repeatedly shown that exposure to anesthesia at a very young age kills brain cells.

对于啮齿动物和猴子的研究也多次说明在年龄非常小的时候接受麻醉会杀死脑细胞。

For example, a certain kind of muscle relaxant for anesthesia will make certain kind of people choke. Finally, scientists found it was because they had certain kind of genes.

例如，某种麻醉用肌肉松弛剂会导致特定的人无法呼吸，最终，科学家发现这种现象的原因在于他们拥有特定的基因。

Another Sierra is a Doctor of anatomy. He was credited fot inventing the first anesthetic. The anesthesia allowed him to operate on his patients without causing pain.

另一位席埃拉是名解剖学博士。他被誉为发明麻醉药的第一人。在麻醉作用下，他可以为病无痛做手术。