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记得那是在2009年甲型H1N1流感的非常时期,人们都十分谨慎,生怕得上这种可怕的传染病。(交代事件背景。“非常时期”点明这些事情发生在非同一般的条件之下,
I remember it was during the extraordinary period of the 2009 H1N1 influenza pandemic. People were very cautious about this terrible epidemic. (Explain the background of the incident. “Extraordinary period ” point out that these things happen under the unusual conditions,