rocketry

n [U] (science or practiceof) using rockets for propelling missiles or spacecraft 火箭学; 火箭技术.

robotic, robotics, robust, robustly, robustness, rock, rock and roll (also ,rock 'n' `roll), rock salmon, rock'n'roll, rock-bottom, rock-cake, rock-climbing, rock-crystal, rock-garden, rock-plant, rock-salt, rock-steady, rocker, rockery, rocket, rockiness, rocking-chair (also rocker), rocking-horse, rocky, rococo, rod, rode, rodent, rodeo, rodomontade, roe, roebuck, roentgen (also rontgen), Rogation Sunday, rogations, roger, rogue, roguery, rogues' gallery, roguish,