by Jason Marshall Weve now talked about three methods for calculating average values: the mean, median, and mode (affectionately known as the three Ms). So, are we done? Is that everything we could ever want to know about interpreting average values?

发表于:2018-12-07 / 阅读(72) / 评论(0) 分类 数学英语

Two vaccines developed by a Maryland company are showing promise in the fight against malaria. One vaccine was 100 percent effective in preventing the deadly disease malaria. That is according to the biotech company Sanaria Inc. of Rockville, Marylan

发表于:2018-12-07 / 阅读(38) / 评论(0) 分类 2017年VOA慢速英语(二)月

This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute? The 2011 Nobel Prize in chemistry goes to Daniel Schechtman of the TechnionIsrael Institute of Technology in Haifa. Schechtman discovered what are called quasicrystals.

发表于:2019-01-08 / 阅读(72) / 评论(0) 分类 Scientific American(十)月

South African researchers at the international AIDS conference in Vienna, Austria have announced major progress in the fight against the disease. The researchers say their study shows a vaginal gel substance reduced the risk of HIV infection among wo

发表于:2019-01-11 / 阅读(36) / 评论(0) 分类 2010年VOA慢速英语(七)月

DEVELOPMENT REPORT - Researchers Develop an Experimental Treatment Against Cervical Cancer By Jill Moss Broadcast: Monday, April 11, 2005 This is Steve Ember with the V.O.A. Special English Developmen

发表于:2019-01-30 / 阅读(53) / 评论(0) 分类 农业与发展

EDUCATION REPORT - International Education Program Aims for Worldly Students By Nancy Steinbach Broadcast: Thursday, September 15, 2005 I'm Shep O'Neal with the VOA Special English Education Report. I

发表于:2019-01-30 / 阅读(72) / 评论(0) 分类 教育与新闻