Rocketry
['rɒkɪtrɪ] or ['rɑkɪtri]
解釋/意思:
(noun.) the branch of engineering science that studies rocket design and operation.
手打:莫尔--From WordNet
['rɒkɪtrɪ] or ['rɑkɪtri]
(noun.) the branch of engineering science that studies rocket design and operation.
手打:莫尔--From WordNet