There are just four kinds: adenine, thymine, guanine and cytosine.只有4种: 腺嘌呤 、 胸腺嘧啶 、 鸟嘌呤和胞核嘧啶.The DNA base composition is 32.6 - 33.1 mol % guanine plus cytosine.DNA(脱氧核糖核酸)的G+C 摩尔百分含量为32.6—33.1.It is a layer of guanine ...
各个时期的思想家和诗人都把仁慈的怜悯心奉献给娼家女子.Thinkers and poets throughout the ages have offered the courtesan the oblation of their mercy.他们说他是个毫无怜悯心 、 一点也不和蔼的冷血动物.They said he is a pitiless , cold - blooded fellow , with no geniality in...
My late teens and early twenties were really rough years.我二十岁前后那几年过得真苦啊。Most people who smoke began smoking in their teens.多数烟民从十几岁时就开始抽烟了。She was in her early teens.她正值豆蔻年华。...