“美洲狮”指的是年纪在三十岁左右的漂亮女人。

Puma refers to an attractive woman in her late 20s or early 30s.

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看起来大概三十岁左右的样子，卷发，下巴上冒着金黄的胡渣。

He looked about thirty, with wavy hair and blond stubble on his chin.

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罗斯建议人们从三十岁左右开始沿袭“石器时代”的饮食习惯——避免食用谷物和乳制品，多吃海鲜、水果、坚果及蔬菜。

Grains and dairy products should be avoided and seafood, fruits, nuts and vegetables embraced.

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