单词	ostium
释义	ostium /ˈɒstɪəm / noun (plural ostia /ˈɒstɪə/) 1 Anatomy & Zoology An opening into a vessel or cavity of the body.The latter arise from the paranasal sinuses and protrude into the nasopharynx through the sinus ostia.... An ascending dissection occasionally can occlude the ostium of a coronary artery and lead to myocardial infarction. Accessory ostia of the maxillary sinus are found in about 30% of skulls; as many as three in one skull have been reported. 1.1 Zoology Each of a number of pores in the wall of a sponge, through which water is drawn in.Water enters through pores called ostia, flows through canals to a spacious chamber called a spongocoel, and finally exits through large openings called oscula.... Both the sponges from Wyoming and those from the Great Basin have trabs of essentially the same size, as well as canals and ostia in the outer wall of essentially the same diameter. For instance, many arthropods have lost extensive metamerism but still have remnants in the form of repeated organs (such as the limbs in cladocerans and spiders, or the heart ostia in a spider opisthosoma). Origin Early 17th century: from Latin, 'door, opening'.
随便看	let-out clause let rip let's let's face it (or let's be honest) let sleeping dogs lie let slip let someone down let someone down gently let someone have it let someone in let someone in on/into let someone know let someone off let someone out let someone/thing alone let someone/thing be let someone/thing go let someone/thing loose let something down let something drop (or fall) let something drop (or rest) let something go (or pass) let something into let something lie let something off

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