开始被使用

Consider also having a hydraulic ram pump (and instructions on how to use, or to build one from scratch, along with sufficient piping to move water....which can be "scavenged" from a home plumbing system) and/or 12V water pumps in storage which may be of use in designing a primitive water distribution system for the home or for crop irrigation (i.e., water can be channeled up to an elevated holding canister).

还要考虑有一个水压撞锤式水泵备有怎样使用的说明书，或从头开始造一个，要有充足的导管取水。。。。。。这可从家庭配管系统中搜寻到）。也可考虑存留一个12伏的电水泵，在为家庭或庄稼灌溉设计原始的水分配系统时，它也许有用处。例如，水可被传输到升高的支持罐中。

Working audio engineers, who assumed the digital interface they used on a daily basis was sonically transparent, became alarmed and began experimenting themselves.

音响工程师们，原本认为他们每日里使用的数码界面是完全&透明&的，被这篇论文惊醒了，开始了各自的试验。

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。