3 + noun
数词作定语，直接修饰名词。
I have 3 apples.
我有3个苹果。
比二多一个
three
比二多一个
being one more than two
I have 3 brothers.
我有三个兄弟。
用法提示：数字 3 修饰名词 brothers，表示数量为三，作形容词/限定词使用。
She bought 3 tickets for the movie.
她买了三张电影票。
用法提示：3 放在名词 tickets 前，表示“三个”，起形容词作用。
The recipe calls for 3 eggs.
这个食谱需要三个鸡蛋。
用法提示：3 修饰 eggs，表示数量三，体现“比二多一个”的含义。
数词作定语，直接修饰名词。
I have 3 apples.
我有3个苹果。
表示倍数比较。
This box is 3 times as heavy as that one.
这个箱子是那个的三倍重。
复合形容词作定语，表示年龄。
She has a 3-year-old daughter.
她有一个三岁的女儿。
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