"70" 英语表达方式是 "seventy".
其来源：英语中的数字词语大多都是由拉丁语转化而来，"seventy" 也不例外，它来自拉丁语 "septuaginta"，意为 "70".
英文例句：
There were seventy people at the party last night.
(昨晚聚会上有70个人。)
It takes seventy hours to complete the project.
(完成这个项目需要70个小时。)
She is seventy years old today.
(今天她70岁了。)