Like squid, they were swimming tentacled molluscs-a group called the cephalopods.
它们象鱿鱼一样是游动的触手软体动物，这类软体动物被称为头足类动物。
All types of oysters (and, indeed, many other shelled molluscs) can secrete pearls, but those from edible oysters have no market value.
所有种类的牡蛎(实际上也包括其他许多有壳的软体动物)都能分泌出珍珠，但是可食用的牡蛎出产的珍珠没有市场价值。
Just as an acid descaler breaks apart limescale inside a kettle, so the shells that protect molluscs and other creatures will be dissolved.
正如酸性清洁剂溶解水壶内的水垢，保护软体动物和其他生物的外壳也会被酸性海水溶解。
Dr Riebesell is particularly interested in the ecosystem role of pteropods, also called sea butterflies. These elegant micro-molluscs are a vital food for some fish.
Riebesell博士对翼足类动物，又叫翼足目软体动物在生态系统中的角色尤其感兴趣，这些幽雅的微小软体动物是一些鱼类的重要食物。
Beihai sits in a tight-lipped bay on the Gulf of Tonkin, where the rich silt of estuaries is swept and trapped by turbid currents-a paradise for molluscs and those that hunt them.
北海市地处一个狭长的海湾，紧邻北部湾，河口的淤泥被浑浊的水流荡涤、堆积。这是软体动物和猎食者的天堂。
Snails and octopuses are molluscs.
蜗牛和章鱼是软体动物。
OIE is a standard-setting body for fish, crustaceans and molluscs.
OIE是制定鱼类、甲壳类和软体动物标准的组织。
Predaceous gastropods reduced the abundance of herbivorous molluscs and sessile invertebrates.
肉食性腹足类减少了草食性软体动物和固着无脊椎动物的数量；
Geologists have found that plankton and molluscs were wiped out in vast Numbers and that land animals and plants were also affected.
地质学家们发现，当时浮游生物和软体动物大量消失，陆生动植物也受到了影响。
Tetraploid molluscs are of low viability but high fecundity and can produce larger gametes. Crosses between tetraploids and diploids can result in 100% triploids.
四倍体贝类存活力较低，但具有较高的繁殖力，能产生较大的生殖细胞，并能与二倍体杂交产生100%的三倍体。
Previous attempts to boost the numbers of native oysters in the bay by banning oyster fishing had proved disappointing because the molluscs failed to re-establish themselves.
有的地方曾尝试通过实施禁捕来提高本地牡蛎的数量，结果却令人失望，该办法并未促进这种软体类动物有效地繁殖。
The new standards adopted will go a long way towards protecting human health, as they set out new, maximum limits for lead in fish, cadmium in rice, marine bivalve molluscs and cephalopods.
通过的这些新标准将对保护人类健康大有帮助，因为它们提出鱼类中铅以及大米、海洋双壳贝类和头足类动物中镉的新的最高限量。
The new standards adopted will go a long way towards protecting human health, as they set out new, maximum limits for lead in fish, cadmium in rice, marine bivalve molluscs and cephalopods.
通过的这些新标准将对保护人类健康大有帮助，因为它们提出鱼类中铅以及大米、海洋双壳贝类和头足类动物中镉的新的最高限量。
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