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...
The ball was caught by a fielder standing just inside the boundary.那个球被正站在边界内的守场员接住了.Arthur is a good fielder but he's got a glass arm.亚瑟是个好外野手,却有一只容易酸痛的手臂.The center fielder made a great catch.中间手接了一记非常漂亮的球....