Occasionally a patient is so debilitated that he must be fed intravenously.偶尔会有病人过于虚弱，必须通过静脉注射进食。Stewart took over yesterday when Russell was debilitated by a stomach virus.昨天拉塞尔因肠胃病毒感染身体不适，由斯图尔特暂时接手。This is especially i...
The helicopter rotor blade deicing technique is greatly important to ensure the flight safe - ty.直升机旋翼桨叶除冰技术对保证直升机飞行安全是十分重要的.It is best to allow the rotor to rotate freely.最好让转子自由旋转.The rotor has recesses in its three fa...