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 ...
It's so easy to lose track of who's playing who and when.很容易就忘记谁要和谁比赛，什么时候比。His mind would wander, and he would lose track of what he was doing.他会走神，忘了自己正在干什么。The farmer has so many chickens, he can often lose ...
At the onset of germination, the hypocotyl elongates rapidly by cell enlargement.萌发开始时, 下胚轴依靠细胞增大而迅速伸长.As the development of the hypocotyl continues, the characteristic crook in the upper portion becomes apparent.由于下胚轴继续...