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Naked skin or effectively naded skin has been the primary interface between the human body and the environment for over 200,000 years. Penn State anthropologist Nina Jablonski on the evolution of human skin pigmentation at the annual meeting of the A
Scientific American(二)月
World Hemophilia Day (WHD) started in 1989 as a way to raise awareness of the disorder and to bring attention to the needs of those who suffer from it. The reason its on April 17 is because thats the birthday of the World Foundation for Hemophilia (W
世界节假日博览
World Hemophilia Day (WHD) started in 1989 as a way to raise awareness of the disorder and to bring attention to the needs of those who suffer from it. The reason its on April 17 is because thats the birthday of the World Foundation for Hemophilia (W
英语课程学习计划和讲义
Bradycardia Don: Yal, isn't normal heart rate somewhere between sixty to one hundred beats per minute？ Yal: That's right, Don. Why? D: This would be the one time you don't correct me. My heart rate is only 44 beats per minute. That means I have bra
英语听力文摘 English Digest
Word Up, Brain 新发展起来的大脑皮层在调节机能上起着主要作用；而皮层下各级脑部及脊髓虽也有发展，但在机能上已从属于大脑皮层。高等动物一旦失去大脑皮层，就不能维持其正常的生命活
英语听力文摘 English Digest
Statistics show that China has over 2 million hearing-impaired children and the number is growing faster than ever. To draw more attention on this Ear Health Day, various educational activities have been held across China. A charity concert was organ
2016CRI中国国际广播电台