optimist

n person who is always hopeful and expects the best in all things 乐观的人; 乐观主义者: He's such an optimist that he's sure he'll soon find a job. 他很乐观, 认为自己一定很快就能找到工作. Cf 参看 pessimist (pessimism).

oppress-ively, oppressed, oppression, oppressive, oppressor, opprobrious, opprobriously, opprobrium, ops, opt, opt out of, optic, optical, optical art, optical illusion, optically, optician, optics, optimal, optimism, optimistic, optimistically, optimization, optimize, optimum, option, optional, optometrist, opulence, opulent, opus, or, or else, or rather, or so, oracle, oracular, oral, orally, orang-utan,