如果发生了令人害怕的事情，交感神经系统会使心跳加快，从而把血液更快地输送到身体各处可能需血的部位。

When something frightening happens, the sympathetic nervous system makes the heart beat faster so that it sends blood more quickly to the different body parts that might need it.

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神经系统学家经过几十年的推理论证发现，事情发生时，人类大脑会为其打下时戳，这就像相机为数码相片文件标上日期和时间一样。

Neuroscientists have theorized for decades that the human brain time stamps events as they happen, just as a camera tags the date and time onto a digital photo file.

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这一改变源于一个目前较为流行的观点，那就是阿尔茨海莫氏病属于神经退行性疾病的范围，在症状表现出来之前的几年就有可能发生神经系统方面的损伤。

The change reflects a modern view that Alzheimer's is a spectrum of mental decline, with damage that can start many years before symptoms appear.

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