A variety of mechanical surfaces have been employed for deflecting the exhaust jets of solid - propellant rockets.人们已经用过各种类型的机械控制面来偏转固体推进剂火箭的排气流.If she made a leading statement, he was expert deflecting her into more imp...
由于幼虫对药物有免疫力，因此必须经常喷药。Because of the immunity of the immature insects, it'simportant to spray regularly.幼虫钻进了地板的缝隙里。The larvae burrow into cracks in the floor.虫卵很快孵化成幼虫。The eggs quickly hatch into larvae....