她目睹了蒙哥马利的公共汽车，伯明翰的高压水龙头，塞尔玛的桥，以及一位亚特兰大的牧师对人们说“我们一定会胜利。”
She was there for the buses in Montgomery, the hoses in Birmingham, a bridge in Selma, and a preacher from Atlanta who told a people that "We ShallOvercome."
钻井水龙头由于结构设计的原因，冲管盘根在钻井过程中不断磨损，特别是在高压泥浆的作用下，盘根密封常常被破坏。
The wash pipe packing of drilling swivel showed wear-and-tear continually in drilling process due to its structural design. The packing assembly was often torn by high pressure mud.
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