查询词典 finless

"The disappearance and extinction of such highly evolved endemic mammals as the white Yangtze River dolphin , the finless porpoise, or the Chinese sturgeon from the Yangtze River can be attributed to a multitude of circumstances, such as the deterioration and loss of their natural habitats, overfishing of the river, the heavy freight ship traffic, and others," Mueller said.

他说，由于受众多因素诸如：白鳍豚自身的退化、它们赖以生存的自然栖息地消失、人类对渔业的过度捕捞、重型货运船舶运输及其它原因的影响，这一有着高度进化历程的无鳍哺乳动物—白鳍豚在长江流域的消失与灭绝。

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。