(1)关于；属于......的；由......制成；反映

①The average age of the women interviewed was only 21.5.

参加面试的女性平均年龄才21.5岁。

②a friend of mine

我的一个朋友。

(2)出自......；在......一方

I suppose it's stupid of us not to be able to make up our own minds.

我们自己都没办法拿定主意，这真是太傻了。

(3)表示程度

①Your extra fat may be more of a health risk than you realize.

多余的脂肪对健康的威胁可能比你意识到的要大。

②As time goes by; sleeping becomes less of a problem.

随着时间的推移，睡眠逐渐不再成为问题。

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