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annulation ['ænju'leɪʃ(ə)n] n
gen. 环形物; 环的组成物; 成环反应
agric. 环 (annulatio)
archit. 环纹
oil 环节动物; 增环反应
tech. 环状物; 环状纹; 环状结构; 环状构造

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