writing paper and envelopes信纸和信封The writing paper is impressed with school seal.信笺上有学校的印记.Drouet selected writing paper while Carrie went to change her dress.杜洛埃找信纸写回信的当儿,嘉莉去换衣服....
这些物质专门依附在细胞膜的蛋白质之上。These are substances which specifically latch onto the protein on the cell membrane.这种萃取改变了整个毛纤维中所有细胞膜的网状结构.Such extraction modifies the whole cell - membrance network throughout the wool fiber.与动物细胞膜不...
Objective To study the immunity duration of attenuated live rubella vaccine.目的了解冻干风疹减毒活疫苗的免疫持久性....round arches and attenuated columns.圆拱门和细长石柱Objective : To analyze the efficiency of delivery for CD 8 + T cell epitope b...