Objective To observe the effect of full thickness lamellar keratoplasty combined with PTK ( photo therapeutic keratectomy ) .目的探讨联合 PTK 的全厚植片深板层角膜移植术的疗效.Objective To observe the application of viscoelastics in penetratin...
道路或被淹没，或被山体滑坡阻塞。Roads were flooded or blocked by landslips.航空业目前的滑坡状况the current downswing in the airline industry建筑业正经历工程量的严重滑坡.The building industry is experiencing a severe downturn in its workload....