| 单词 | Trachylina | 
| 释义 | Trachylinaplural noun  Trachy·li·na    : an order of Hydrozoa comprising forms that lack a polyp stage and including the suborder Trachomedusae and Narcomedusae    trachyline  ˈ⸗⸗ˌlīn -lə̇n | 
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