人体通过晒太阳来合成维生素D，可是皮肤科医生理查德·威勒指出，阳光还可以带来另一个惊人的益处。他的团队通过新研究表明：一氧化氮这种大量储存在皮肤中的化学传递质，能通过紫外线照射而释放出来，对血压和心血管系统产生很大益处。这是什么意思呢？那好，就从解释为什么苏格兰人比澳大利亚人更容易生病开始吧…… 演讲（无字幕）： Richard Weller: Could

Obama's Weekly Address WEEKLY ADDRESS: Enrolling in the Affordable Care Act Marketplace 奥巴马每周电视讲话:总统呼吁全美国人民支持平价医保法 Hi, everybody. 大家好。 A few weeks ago, we launched an important new part of the Afforda

And it seems to me that the first question 我的看法是， is entirely a biology question, 第一个问题完全是生物学的问题， and it's extremely hard to answer. 这是非常难回答。 One has to be very speculative, 一个人必须非常投机， and many of

And that wasn't a difficult diagnosis to make. 这不是一个困难的诊断。 I made it and I set to work treating her. 作出诊断后我开始着手帮她治疗。 I gave her aspirin. I gave her medications to relieve the strain on her heart. 我开给了

Unlike any other creature on this planet, human beings can learn and understand, without having experienced. They can think themselves into other people's places. 与这个星球上任何其他的动物不同，人类可以学习和理解未曾经历过的事情