这个星期他们一直在安装设备。
在安装设备之前,应该彻底清洗管道,清除外来杂质。
Pipe lines should be thoroughly flushed to remove foreign material before installing the unit.
在保持一定距离的同时,潜水员会安装设备来测量这个漩涡的流速。
Keeping his distance, a diver sets up equipment to measure the whirlpool's flow rate.
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