单词:sperm pronucleus
单词:sperm pronucleus 相关文章
EXPLORATIONS - Scientists Call for Quieter Ships to Protect Whales BARBARA KLEIN: Im Barbara Klein. STEVE EMBER: And Im Steve Ember with EXPLORATIONS in VOA Special English. Our subject today is whales. We discuss a report on the effect of noise from
RACHEL MARTIN, HOST: A wide-ranging study shows that sperm counts are plummeting throughout the Western world, and scientists don't know why. NPR health correspondent Rob Stein suggests some of the potential reasons. ROB STEIN, BYLINE: In Margaret At
What Is Progeria? Progeria was first described in the nineteenth century. The mysterious disease is often thought of as premature aging. Children with progeria are normal for their first year of life, but then develop medical problems normally seen i
Beijing, Sept. 6 (Xinhua) -- A sperm donation scandal disclosed recently has aroused growing concern in the United States. According to the New York Times' report, Ryan Kramer, the son of a donor, found that he has more than 150 half-siblings - they
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
讲解: Today's key word is Egg. Egg 卵子 Here, an egg is a cell that is produced in the bodies of female animals and humans. If it is fertilized by a sperm, a baby develops from it. 当一个卵子遇到一个精子,就诞生了一个小宝贝。