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1. (数字) 70
Seventy is the number
70.
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.
3. 七十年代(指 1970 年至 1979 年)
The seventies is the decade between 1970 and
1979.