seventy，主要用作为英语单词，名词、形容词、数词，作名词时意为“七十；七十个；七十岁；七十年代”。作形容词时意为“七十的；七十个的；七十岁的”。作数词时意为“七十”。

根据《柯林斯英汉双解大词典 》：

NUM Seventy is the number 70. 70; 七十

N-PLURAL When you talk about the seventies, you are referring to numbers between 70 and 79. For example, if you are in your seventies, you are aged between 70 and 79. If the temperature is in the seventies, it is between 70 and 79. 70多; 七十几 (指70到79之间的数字)

N-PLURAL The seventies is the decade between 1970 and 1979. 70年代; 七十年代 (指1970 到1979之间的年代)

At Seventy 到七十

Or Seventy 或七十岁

Seventy Island 七零岛

Seventy Eighth 七十八

Seventy Islands 洛克群岛所属的七十岛

Seventy elders 七十个长老

Seventy Years 七十年

Lesson Seventy 第七十课

Seventy people were killed.

70人丧生。

Seventy thousand tons of oil spilled from the tanker.

7万吨油从油轮漏出。

Seventy-two percent of people now work in service industries.

72%的人现今从事服务业。