短语
中文翻译：在很久以前
同义词：
['in the olden days', 'bygone days', 'bygone eras']
例句：
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1. In the days of old, people used to travel by horseback.
在很久以前，人们曾经骑马旅行。
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2. The old man remembers those days of old fondly.
那位老人怀念着那些旧时光。
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3. She spent her childhood in the days of old.
她在旧时代度过了她的童年。