It is calculated by dividing a person's weight in kg by their height in meters squared, and a BMI of between 19 and 25 is considered healthy.

它的计算方法是用一个人的体重（公斤）除以身高（米）的平方，BMI 在19到25之间被认为是健康的。

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By the way, it is important not to forget that the balloon weighs about 2 kg and this weight has also to be lifted.

顺便说一下，不要忘记气球本身的重量，气球重2千克，这部分重量也是要被提升的。

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The rats were fed of fru12.5 grams ctose per kg (2.2 pounds) of weight every day for a year.

在一年的时间里，这些老鼠遵循了每天每千克（2.2磅）体重摄取12.5克果糖的标准。

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Body Mass Index (BMI) is defined as the ratio of weight (in kg) to height (in meters) squared and is an inexact measure of body fat, though it supposedly establishes cutoff points of normal weight, overweight, and obesity.

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