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50 + [plural noun]
“50”后接可数名词复数，表示数量。
50 books
50本书
fifty
先理解核心含义，再看它在真实句子里的用法。
fifty
the cardinal number that is the product of ten and five
50 books
50本书
fifty
n the cardinal number that is the product of ten and five；s being ten more than forty
She celebrated her 50th birthday with a big party, marking the milestone of turning 50.
她举办了一个大型派对庆祝自己的50岁生日，标志着人生进入了50岁这一重要阶段。
The speed limit on this highway is 50 miles per hour, so you should not exceed 50.
这条高速公路的限速是每小时50英里，所以你不应超过50。
He scored a perfect 50 on the test, which was the highest possible score.
他在考试中得了满分50分，这是可能的最高分。
“50”后接可数名词复数，表示数量。
50 books
50本书
表年龄时用“be 50 years old”。
She is 50 years old.
她50岁了。
表百分比时，后接of短语。
50 percent of students passed the exam.
50%的学生通过了考试。
用于编号，如页码、房间号等。
Turn to page 50.
翻到第50页。
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Dictionary facts from ECDICT, WORDNET.