单词	protractor
释义	protractorprotractor /proʊˈtræktɚ, prə-/ noun [countable] math, geometry an instrument, usually in the shape of a half-circle, used for measuring and drawing angles
随便看	Osiris -osis Oslo osmosis osmotic osprey osseous ossification ossify ostensible ostensibly ostentation ostentatious ostentatiously osteo- osteoarthritis osteopath osteopathy osteoporosis ostracism ostracize ostrich Ostrogoths, the Oswald, Lee Harvey OT

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