查询词典 bivalve

Any of various minute,chiefly freshwater crustaceans of the subclass Ostracoda,having a bivalve carapace.

每周3次各20分钟的增氧运动足以让大多数人保持身体康健。

Any of various minute , chiefly freshwater crustaceans of the subclass Ostracoda, having a bivalve carapace.

卢布克爵士最近指出，小型甲壳类中有几种较好的例子，可作为这一法则的说明。

Any of various minute, chiefly freshwater crustaceans of the subclass Ostracoda, having a bivalve carapace.

介形亚纲动物属介形亚纲的任一种体小的、主要生活于淡水中的甲壳纲动物，长有一对硬壳

Any of several edible bivalve mollusks of the family Ostreidae, especially of the genera Crassostrea and Ostrea, that live chiefly in shallow marine waters and have a rough, irregularly shaped shell.

牡蛎：任一种蛎科的可食用的双壳软体动物，尤指巨蛎属和牡蛎属，主要生活在浅海水中并有坚硬的不规则形状的壳

There is a case of an oysterlike bivalve that evolved a more and more spiraled shell until, just before extinction, the valves could barely open.

这里有个例子，一种牡蛎状双壳类，进化出越来越趋螺旋状的外壳，直到该物种灭绝，其外壳已几乎不能打开。

There is a case of an oysterlike bivalve that evolved a more and more spiraled shell until, just before extinction, the valves could barely open.

这里有个例子，一种牡蛎状双壳贝，进化出越来越趋螺旋状的外壳，直到该物种灭绝前，其外壳已经几乎打不开了。

There is a case of an oysterlike bivalve that evolved a more and more spiraled shell until, just before extinction, the valves could barely open.

而且为什么灭绝发生在同一族群，仿佛是劣质基因的责任？

There is a case of an oysterlike bivalve that evolved a more and more spiraled shell until, just before extinction, the valves could barely open.

这里有个例子，一种牡蛎状双壳类软体动物，进化出越来越趋螺旋状的外壳，这种进化直到该物种灭绝前未停止过，其外壳已几乎不能开合。

There is a case of an oysterlike bivalve that evolved a more and more spiraled shell until, just before extinction, the valves could barely open.

而且为什么灭绝发生在同一族群，仿佛是拜劣质基因所赐似的？

It is very difficult to get any suitable result on the basis of genus, or higher taxon in studying Jurassic bivalve palaeobiogeography.

聚类分析结果以及对控制藏北、藏南和印度侏罗纪双壳类动物群分布因素的分析表明，侏罗纪时，藏南地块的位置更靠近藏北地区，而距印度次大陆较远，与前人认识不同。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。