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单词 annulation
释义 annulation|ænjuːˈleɪʃən|
[n. of action f. annulate.]
The formation of rings or ring-like divisions; concr. a ring-like structure, a ring.
1829? Jesse Jrnl. Natur. 332 The whole body of the animal [hairworm] consists of numerous annulations.1870Rolleston Anim. Life Introd. 123 Their [worms'] bodies are..divided externally by annulation.1872Nicholson Palæont. 271 The walls of the shell are..surrounded with numerous thickened rings or annulations.
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