使为奴隶

Human beings, for the most not part are not like this. When the Arabs, who had been used to living sparingly on a few dates acquired the riches of the Eastern Roman Empire and dwelt in palaces of almost unbelievable luxury, they did not, on that account, become inactive.

习惯于吃几个枣充饥的阿拉伯人没有因为获得了东罗马帝国的财富，稍一点头，希腊奴隶就会为他们端上最精美的食物，然而是其他欲望使他们行动起来，尤其是以下四种。

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。