vi. back-mutate的变形

Scientists Getting Closer to Finding AIDS Cure 科学家治愈艾滋病的希望更大了 Scientists searching for a cure for AIDS say they have uncovered the basic chemistry of the HIV virus and that the most likely strategy for fighting the disease

发表于:2018-12-16 / 阅读(109) / 评论(0) 分类 VOA标准英语2014年(十二月)

This is Scientific Americans 60-Second Science. Im Steve Mirsky. Got a minute? Generations of American children have been told, Eat your broccoli! And for decades, researchers have known that broccoli and related vegetables like cauliflower and water

发表于:2018-12-24 / 阅读(144) / 评论(0) 分类 Scientific American(一)月

New Test Could Find Cancer Earlier 新的测试可以发现早期癌症 From VOA Learning English, this is the Health Lifestyle report. Cancer is a leading cause of death around the world. When it comes to cancer, the sooner you know you have it, the

发表于:2019-01-12 / 阅读(339) / 评论(0) 分类 2016年VOA慢速英语(十一)月

By Carol Pearson Washington, D.C. 22 June 2007 Studies show that women with a strong family history of breast cancer -- meaning their mothers, sisters, aunts or grandmothers had the disease -- have a higher risk of getting breast cancer, too. But a

发表于:2019-01-13 / 阅读(161) / 评论(0) 分类 2007年VOA标准英语(六月)