Mother trees colonize their kin with bigger mycorrhizal networks. 母树通过更大的菌根网络来覆盖住自己孩子们所在的区域。 They send them more carbon below ground. 在地下，它们给孩子们会送去更多的碳。 They even reduce their own root competition to

REMARKS BY THE PRESIDENT ON HEALTH CARE AND THE SENATE VOTE ON F-22 FUNDING THE PRESIDENT: Good afternoon, everybody. Before I talk about the progress we’re making on health insurance reform, I want t

导读：Liz Murray，影片《风雨哈佛路》的主人公在真实生活中的原型。生于贫困窟，却渴望知识，17岁开始用2年的时光学完高中4年课程，获得1996年纽约时报一等奖学金，进入哈佛学习。看了这么多，你一定很好奇她是什么样的人物，拥有着怎样的心态，我们赶快来欣赏一下Liz的励志演讲吧。 EN: Murray was born in the Bronx, New York, to poor, drug

Respected teachers, my fellow students. Today my topic is save resources, better tomorrow. As we all know, the pollution problem may be one of the greatest problems in the world. Please look out of th

So this is the complexity of the world that surrounds us. 所以这就是我们所处环境的复杂性。 This perhaps is why we find the God complex so tempting. 这也许正是为什么我们发现“万能神力”这么有吸引力的原因。 We tend to retreat and say, "We can dra