50 + noun (表示数量)
I have 50 books.
我有50本书。
五十
fifty
being ten more than forty
fifty
n the cardinal number that is the product of ten and five；s being ten more than forty
She is 50 years old.
她50岁。
用法提示：数字50用作形容词，表示年龄五十。
There are 50 chairs in the room.
房间里有50把椅子。
用法提示：数字50用作形容词，修饰名词，表示数量五十。
The speed limit is 50 miles per hour.
限速是每小时50英里。
用法提示：数字50用作形容词，表示速度限制为五十。
I have 50 books.
我有50本书。
She is 50 years old.
她50岁。
50 percent of students passed the exam.
50%的学生通过了考试。
fifteen表示15，fifty表示50，两者在发音和拼写上相近，尤其易在听力中混淆。
fifty是基数词表数量，fiftieth是序数词表顺序，用法不同。
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