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Fingernails. Theyre good for scratching, biting, clipping, and polishing. But what are they, in fact? 手指甲可以被用来划，咬，剪，磨。但是事实上，它们究竟是什么呢？ Although nails may look simple, they actually have var
初学者听力文摘精选
During times of drought, animals are stressed to the limit. 在干旱时期，动物们的压力已至极限。 Normal behavior is basically thrown out the window and it becomes a no holds bar fight for survival. 通常的行为都已不再适用，这
侏罗纪搏击俱乐部
Pre-Listening Vocabulary dominant: strong; used most often keratin: a fibrous protein found in hair, nails, and the outer layer of skin puberty: the growth period during which a childs body reaches sexual maturity nail-biting: causing anxiety or nerv
趣谈英语
Junctional epithelium - the epithelium which seals the base of the gingival sulcus against the tooth. Keratan sulphate - a glycosaminoglycan found in cartilage, with chondroitin sulphate. Keratin - a
医务英语
ichthyosis 鱼鳞病 impetigo 脓疱疮 isomorphic reaction 同形反应 keratin 角蛋白 keratinocyte 角质形成细胞 keatolytics 角质松解剂 keratoplastics 角化促成剂 lamella lucida 透明
医务英语
Paracrine - cell messengers also called cytokines which are locally acting, produced by neighbouring cells or the extracellular matrix, as distinct from as distinct from endochrine or hormonal messeng
医务英语