种皮上留有种脐或种痕.The seed coat is marked with a hilum or seed scar.偶而, 脐周淋巴结可触及.Occasionally, lymph nodes can be found in the vicinity of the umbilicus.方法体外培养人脐静脉内皮细胞,通过传代形成细胞的衰老模型.Methods Human umbilical vein endothelial cell...
她的诗在风格上是时髦的实验派，主题艰深难懂。Her poems are modishly experi-mental in style and recondite in subject-matter.这说明书看起来很难懂。The instructions look very complicated.这些注释有助于弄清文中最难懂的部分.The note help to elucidate the most difficult parts ...