Her popular pot holder is also available in do-it-yourself kits.她那广受欢迎的防烫布垫也可以自己购买原料套装自己制作。Kasparov became the youngest world title-holder at 22.卡斯帕罗夫22岁时成为最年轻的世界冠军。a season ticket holder有季票的人...
异染色质大部分是由短而重复的多核苷酸序列所组成的.Heterochromatin has shown to be composed largely of short repeated polynucleotide sequences.表现这种现象的染色体物质叫做异染色质.Chromosome material with exhibits of such behaviour is called heterochromatin.异染色质部分...