Bacteria are the oldest living organisms on the earth. 细菌是地球上最古老的生物。 They've been here for billions of years, and what they are are single-celled microscopic organisms. 它们已经存在数十亿年了，它们是单细胞微生物。 So they

如何才能激发每个孩子成为终生阅读者？选择那些能让大人和孩子都发笑的阅读材料即可。 Alvin Irby: How to inspire every child to be a lifelong reader 如何激发每个孩子成为终生阅读者？ As an elementary school teacher, my mom did everything she could to ensure I ha

So I'm not saying, "Be like us", and "We're perfect role models", because we're not, but we just want to help represent girls in a way that shows those different dimensions. 所以我不是在说，“学我们的样子” 和“我们是完美的典

"Those of us who grew up playing basketball, whether on a playground in the city or a farm in the heartland, are grateful to the game for the lessons it teaches us about life," President Obama says in

February 13, 2008 THE PRESIDENT: Thanks for coming. Thanks for the warm welcome. I'm pleased to be joined by leaders of both parties to enact an economic growth package for the American people. You kn