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 ...
The Spanish Steps were crowded with the sellers of grotesque caricatures.西班牙阶梯上挤满了出售荒诞漫画的人。The boys amused themselves by drawing caricatures of their teacher.这些男孩画他们老师的漫画来取乐.He does very funny caricatures of all his frie...
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 ...