单词：bed-material load
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Making Stem Cells From Ordinary Adult Cells Most cells in our bodies are unipotent, that is they stay the same throughout their lives. For example, once a skin cell, always a skin cellthey never start turning into brain cells. The exception is stem c
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Airplane mode (or flight mode) means someone cutsthemselves off from the world by not logging on to socialnetworking sites or checking their cell phones. This usuallyoccurs after a breakup or a rough work week. 飞行模式指不上社交网站，也不
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By Michael Bowman Washington 07 June 2007 Scientists in the United States say they have for the first time been able to create stem cells from the ordinary skin cells of mice, a breakthrough that could lead to new medical breakthroughs and eliminate
2007年VOA标准英语（六月）
By Deborah Tate Washington 19 July 2006 watch Bush Stem Cell report The U.S. Senate has approved and sent to President Bush a bill that would allow federal funding of embryonic stem cell research. The president opposes the measure on moral grounds,
2006年VOA标准英语（七月）
有没有遇到过这样的人：拿着手机在地铁里打电话，声音还特别大，搞得旁边的人想不听都不行。现在才知道，这样的人全世界都有，而且他们有名字的哦，叫做stage-phoner。 A person who engages
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WASHINGTON, Aug. 4 (Xinhua) -- Researchers have found a way to turn mouse embryonic stem cells into sperm and this finding opens up new avenues for infertility research and treatment, according to astudy published Thursday in the online edition of jo
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