单词：j-shaped chromosome
单词：j-shaped chromosome 相关文章
Scientists at the Whitehead Institute in Cambridge, Massachusetts say it's fortunate for humans that the Y chromosome is not on the verge of extinction. That's because the Y is the chromosome that makes males males. The outlook is less favorable for
2005年NPR美国国家公共电台
Fins 鱼鳍 Fish can swim well with their fins in water. 鱼因为有鳍能在水里畅游。 Also, fish cannot move without fins. 相反的，没有鱼鳍，鱼就不能游了。 Do you know that different fish have different shapes of fins? 你知道
与美国小学生一起学英文第6册
This is the VOA Special English Health Report. A miscarriage is the natural loss of a pregnancy before the twentieth week. This happens to as many as twenty percent of known pregnancies. Experts say many pregnancies end before a woman even knows she
2010年VOA慢速英语(八)月
pear-shaped的本义是“梨形的、底宽顶窄的”，它通常可以引申为另一个意思：“全完了，都毁了”。 这种用法最早出现在20世纪60年代，由英语短语go pear
英文语法词汇
In mammals, the sex of a baby is determined by the combination of chromosomes it inherits from its parents. Nearly every cell in a male body has two different sex chromosomesone is shaped like an X and one is shaped like a Y. Females also have two se
英语时差8，16