身体单薄却爱活蹦乱跳。
我姨父身体单薄，弱不禁风，逆来顺受，跟我姨一点也不般配。
My uncle was a thin, puny little man, very meek and acquiescent, and no match for my aunt.
如果你相当单薄(体重指数为19或更少)或者身体骨架很小的话，你患上骨质疏松的风险也很高，因为如果这样的话，当上年纪后你的骨量可能会较少而不胜流失。
You're also at greater risk if you're extremely thin (with a body mass index of 19 or less) or have a small body frame because you may have less bone mass to draw from as you age.
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