Testing VD pathogen through PCR may efficaciously prevent, cure and control VD.利用PCR技术检测性病病原体,可有效的预防, 治疗和控制性病.Results In those pathogen there 52 % is Gram - positive bacteria, there 48 % is Gram - negative bacteria.结果致病菌...
aeons of geological history数以亿万年计的地质史The workers skirted the edge of the cliff on a geological survey.工人们沿着崖壁作了一次地质勘察.The mines had been closed down following a geological survey.继一次地质调查之后,这些矿井已被关闭了....
In 1957, the Soviets launched Sputnik 1 into outer space.1957年，苏联人将“斯普特尼克1号”人造卫星送入了外层空间。A public challenge could provoke the Soviets to dig in.公开挑战会促使苏联人一意孤行.The Soviets would more than recover the ground they had lost.苏...