In such situations specific laboratory tests are necessary to establish the etiology.在此情况下,需要特异性实验来确定病原.Acute sinusitis is usually initiated by an acute respiratory tract infection of viral etiology.急性鼻窦炎常常是由病毒性病因的急性呼吸道感...
Hundreds of office buildings and homes developed large cracks in walls and ceilings.数百栋写字楼和住宅楼的墙壁和天花板上都出现了裂缝。...large fans hanging from ceilings...吊挂在天花板上的大风扇The walls and ceilings of contemporary auditoriums usually con...