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A HISTORY LESSON ON THE PANDEMIC（2020.10.29） Since the Covid-19 pandemic started, people have begun "social distancing"—keeping a safe space between you and anyone you don't live with. Though it has been a very popular topic this year, social distancing __40__ . In fact, it was widely used in the U.S. in the flu pandemic in 1918. But how well did it work? The Americans' experience can tell us whether it really saved lives. （附圖：1918年9月11日至1919年2月19日 Portland、New York、Denver、Pittsburgh 四城市「每週每十萬人死亡人數」折線圖，並以灰色區塊標示各城市實施社交距離的期間，圖略） From the picture, we can see that __41__ started social distancing earlier than the other three cities. This helped the city keep the number of deaths down. Besides taking early action, keeping the action long enough was also important in fighting the pandemic. The picture shows that Portland and Denver did well in the first few weeks. However, both cities __42__ , and the numbers of deaths climbed again. But there was one thing Portland did right. The city used several ways of social distancing at the same time to deal with the pandemic. __43__ , sick people were kept away from healthy ones; schools were closed; public activities were not allowed. All these were useful in keeping people safe. The lessons of the 1918 pandemic bring us hope. While we are still learning to fight Covid-19, social distancing may be the best way to get us through the dark days, at least for now. （加註：pandemic （疾病的）大流行；per 每(一)）