The Breguet - Richet Quadrotor helicopter Gyroplane No.1 built in 1907 is reported to have lifted into flight.据报道,1907年,Breguet-Richet四旋翼直升机“旋翼机1号”已经飞了起来....
医生使他的病人发汗.The doctor sweated his patient.终于我用发汗的手拿起话筒拨了那个号.Finally, with sweaty palms, I lifted the receiver and dialed.通过分析多孔材料骨架温度的变化趋势,研究了影响发汗冷却效率的因素.The factors that influence the effectiveness of transpiration cooli...