70

The library has 70 new computers this year.

用法提示：70 作定语修饰名词 computers，表示数量七十。

My grandfather is 70 years old and still goes hiking.

用法提示：70 在 age 结构中作形容词性数词，表示年龄七十。

The office is about 70 kilometers from the airport.

用法提示：70 作定语修饰 kilometers，表示距离七十。