科研之友
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摘要
<正>It was a cold evening one hundred years ago in China.Winter had just arrived and snow had been falling all day.那是一百年前中国的一个寒冷的夜晚。冬天刚来临,雪已经下了一整天了。Doctor Zhang walked slowly through the knee-deep1 snow on his way home after a long day.Then he saw his young neighbor,Xiao Chen.经过了漫长的一天,张大夫在齐膝深的雪中蹒跚地回家。然后他看到了他的年轻邻居小陈。
