你需要了解的第二个数字是身体质量指数(BMI)，你要用身高和体重来计算你的BM I值。

Knowing your Body Mass Index (BMI) is the second number you should know. You need two Numbers to calculate your BMI, your height and weight.

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研究人员计算出在记忆测试里她们每超过一个身体质量系数（BMI——身高kg/体重m的平方）值，她们的记忆力就下降一个单位。

The researchers calculated that every extra point of body mass index (BMI – your weight in kilograms divided by the square of your height in metres) led to a 1-point drop in the memory test.

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利用这些数据，研究人员计算出这些患者确诊一年前的BM I值(体重指数)。

Using those Numbers, researchers calculated what the men's BMI (body mass index) had been one year before being diagnosed.

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