音标：['ɔstriə] ；

n. [古生物]牡蛎属

n. A genus of bivalve Mollusca which includes the true
oysters.

词型变化：名词复数形式 : ostreas

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anatinella nicobarica

and-so

Archimedean screw bow unit

at one's finger's tips

auditor's professional judgement

bamboo cane

Battle sign