Among the many special moments of the summer of 2012, there was nothing more inspiring than the way our Paralympics captured the imagination of the world, fundamentally changing attitudes towards disa
2009年9月8日，奥巴马总统在弗吉尼亚州阿灵顿郡（Arlington, Virginia）韦克菲尔德高中（Wakefield High School）对全美中小学生发表讲话，强调上学读书的重要性，激励学生努力学习。以下是讲话全文： REMARKS BY THE PRESIDENT IN A NATIONAL ADDRESS TO AMERICA’S SCHOOLCHILDREN Wakefiel
The siRNA is deployed first. It acts for hours, giving enough time to silence and block those survival genes. siRNA首先开始行动。它需要几个小时，来让（癌细胞的）生存基因失效。 We have now disabled those genetic superpowers. 我们去除了（
Hi, everybody. 大家好。 It was five years ago this week that a financial crisis on Wall Street spread to Main Street, and very nearly turned a recession into a depression. 5年前的本周华尔街金融危机蔓延至中产阶级的经济危机，而这场危机差
