短语讲解：

1. BMI is a way to measure a person’s height compared to their weight.

compare to 把…比作， 喻为; 与…相比
例句：We should compare to this problem more further the high opinion to that problem.
我们对这个问题应比对那个问题更加重视。

2. About a fourth of the world’s underweight people live in India and Bangladesh.

live in 住在学习[工作]的地方; 住在（某地）; 存在于…
例句：We used to live in Shanghai but now we live in Beijing.
我们以前住在上海，但现在住在北京。

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