厣
yǎn
- 名operculum; lid
厣 厣
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螺类介壳口圆片状的盖。
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蟹腹下面的薄壳。
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方法室内浸泡试验，试验分为4组，每组30只钉螺。分别于3、6、24h观察钉螺开厣率和上爬附壁率和死亡率。
Methods In indoor immersing experimentation , the experiments were divided into 4 groups , 30 snails in each group , to observe the rate of opening operculum , the rate of climbing adhersion and the rate of death at 3 , 6 and 24 hours respectively .
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中国北方海产腹足类厣的研究
A Study on the Operculum of Marine Gastropoda in the North Part of China
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结论槟榔碱、化合物Ⅱ和Ⅳ有较强的灭螺效果，对钉螺的开厣率，槟榔碱、化合物Ⅱ和Ⅳ高于氯硝柳胺。
For the rate of operculum-opening of oncomelania , arecoline , compound ⅱ and ⅳ are greater than niclosamide .