某些病毒的核衣壳是由被膜所包绕.In some viruses the nucleocapsid is surrounded by an envelope.衣壳同包围它的核酸一起称为核衣壳.The capsid together with the enclosed nucleic acid is the nucleocapsid.其核酸结构为线状双股DNA, 衣壳为二十面体对称,有囊膜.It has linear double stra...
Some residual fatty tissue or thin skin may remain after involution.一些残留脂肪组织或薄皮儿可能在消退后有所遗留.Thymic involution caused by child abuse might lead to secondary immunodeficiency.儿童虐待所致的胸腺退缩可能导致继发性免疫机能不全.What's the differe...
抬起一只脚，弯曲脚趾，使脚尖朝下。Raise one foot, curl the toes and point the foot down-wards.她弯腰向下,左右手交叉触及脚趾.She reached down, touching her toes with opposite hands.我双腿麻木，脚趾疼痛。My legs felt numb and my toes ached....