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70 + noun
数字70直接修饰名词，表示数量。
There are 70 students in the class.
班上有70名学生。
七十
先理解核心含义，再看它在真实句子里的用法。
七十
the number 70
There are 70 students in the class.
班上有70名学生。
十乘七的基数
the cardinal number that is the product of ten and seven
At the marathon, the number 70 was pinned to the back of his jacket.
在马拉松比赛中，数字70被别在他的夹克背面。
My grandfather is turning 70 next week, so the whole family is planning a surprise party.
我的祖父下周就要满70岁了，所以全家人正在计划一场惊喜派对。
The calculator showed 70 as the answer, and I wrote it down quickly.
计算器显示答案70，我迅速把它写了下来。
数字70直接修饰名词，表示数量。
There are 70 students in the class.
班上有70名学生。
表示年龄，be动词后接70。
My grandfather is 70.
我祖父70岁了。
用于表示整体中的一部分。
70 of the candidates passed the exam.
70名候选人通过了考试。
Not this
I am seventeen years old.
Use this
I am seventy years old.
数字seventy（七十）容易与seventeen（十七）混淆，注意发音和拼写差异。
Not this
He is seventies years old.
Use this
He is seventy years old.
表示具体年龄时，要用基数词seventy，而不是复数形式seventies。
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Dictionary facts from ECDICT.