at that time;

Life was hard, and it became harder as the war progressed.
那时候生活很艰难,并且随着战争的持续愈发艰难了。
来源:《柯林斯高阶英汉双解学习词典》In those days, dentistry was basic. Extractions were carried out without anaesthetic.
那时候,牙科学刚起步,拔牙都不打麻药。
来源:《柯林斯高阶英汉双解学习词典》
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