英汉词典

1. (数字) 70
    Seventy is the number 70.

    e.g. Seventy people were killed.
           70 人丧生。

2. 七十几(指 70 至 79 之间的数字)
    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.

    e.g. It's a long way to go for two people in their seventies.
           对于两个七十几岁的人来说,这段路太远了。

3. 七十年代(指 1970 年至 1979 年)
    The seventies is the decade between 1970 and 1979.

seventy

    e.g. In the late Seventies, things had to be new, modern, revolutionary.
           20 世纪 70 年代晚期，一切都要新奇、时髦、标新立异。