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Any of numerous usually marine and free-swimming coelenterates that constitute the sexually reproductive forms of hydrozoans and scyphozoans.
大量的、经常在海中自由游动的腔肠动物，它们组成水螅和钵水母的两性繁殖的形式。
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A gas-filled sac serving as a float in some colonial marine hydrozoans, such as the Portuguese man-of-war.
气囊，浮囊在某些群居的海生水螅纲动物中，用作漂浮物的一种充气小囊，如葡萄牙的僧帽水母的浮囊
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A horny external covering that encloses the polyp colonies of certain hydrozoans.
主要为落叶性雌雄同体乔木或灌木的一个属；角树。
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A material impervious to water .A gas-filled sac serving as a float in some colonial marine hydrozoans, such as the Portuguese man-of-war.
气囊，浮囊在某些群居的海生水螅纲动物中，用作漂浮物的一种充气小囊，如葡萄牙的僧帽水母的浮囊
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hydrozoans：水螅类
hydrozoa 水螅类 | hydrozoans 水螅类 | hydrula 螅状子