某个世纪的七十年代(如1870年代、1970年代等)。
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某个世纪的七十年代(如1870年代、1970年代等)。；人一生中70至79岁的十年；70至79之间的范围；七十( seventy的名词复数 ); 从七十到七十九的数目、年数或温度
The decade of the 1870s, 1970s, etc.
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某个世纪的七十年代(如1870年代、1970年代等)。
The decade of the 1870s, 1970s, etc.
人一生中70至79岁的十年
The decade of one's life from age 70 through age 79.
70至79之间的范围
The range between 70 and 79.
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