我们现在已经有了像神经成像和全基因组扫描那样的工具来搜寻与阿尔茨海默氏症有关的基因，以及经一大批经过长时间随访的人群样本。

We now have such tools as neuroimaging and genome-wide scans that hunt for genes related to risk, as well as big samples of people who've been followed over time.

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那么在派遣一批火警人员进入火海似的大楼之前，为什么不派遣一组机器人进去呢？

Before you send firemen into a burning building, why not send in a group of robots?

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之后他们请来一批专科医生来检查这些植入干细胞的患者与没有植入干细胞的相似脑外伤患者空白对照组。

Then they asked a separate group of specialists to look both at their experimental patients and at a group of people with similar brain injuries but no transplant.

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