astronautics

n [sing v] science and technology of space travel 航天学; 太空飞行学.

astir, astonish, astonished, astonishing, astonishingly, astonishment, astound, astounding, astrakhan, astral, astray, astride, astringency, astringent, astro-, astrolabe, astrologer, astrological, astrology, astronaut, astronomer, astronomical, astronomy, astrophysics, astute, astutely, astuteness, asunder, Aswan Dam, asylum, asymmetric, asymmetrical, asymmetry, asynchronous, at, at (the) best, at (the) worst, at a disadvantage, at a good pace, at a guess,