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  • 英语课程计划-World Down Syndrome Day

    World Down Syndrome Day is on March the 21st every year. It is on this day because the number 21 is important in the identification of Down Syndrome. The condition is created by a 21st, extra chromosome being replicated three times, thus causing the...

  • VOA慢速英语2010年-In Study, Aspirin Reduces Deaths From

    BOB DOUGHTY: This is SCIENCE IN THE NEWS in VOA Special English. I'm Bob Doughty. FAITH LAPIDUS: And Im Faith Lapidus. This week, we will tell the story of aspirin. (MUSIC) BOB DOUGHTY: People have known since ancient times that aspirin lessens pain...

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