墓碑三三两两地竖立在地面上。Tombstones jutted out of the ground in broken clusters.她的头发一簇簇竖立着。Her hair stood out in spikes.一根天线在草地边上竖立着。An aerial thrust up from the grass verge....
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 ...
She pampers her own spoiled children and brings Jane up as little better than a servant.她对她那些被宠坏了的孩子娇生惯养,但对简则有如对待佣仆.The biggest is Pampers nappies , which collected more than $ 7 billion last year.最大的是帮宝适(Pampers)纸尿裤, 去年...