The other two, thymine and cytosine, are single ring structures called pyrimidines.另两个为胸腺嘧啶和胞嘧啶, 即称为嘧啶的单环结构.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 compo...
那是个精彩的故事 —— 可是,但愿 ‘ 小小鸡 ’ 中说的天塌下来永远都是胡说八道. ”It's a fine story -- but may'Chicken Little'always be wrong about the sky falling down. "他们结合后生下艾尼阿斯, 他是神话中说的罗马人的祖先.From this union was born Aeneas, the mythical...