The bls expects the demand for roustabouts to decline slowly over the next decade .

劳工局预计下一时期对于码头工人的需求将会变慢。

A relatively specialized field , roustabouts perform maintenance on oil rigs and pipelines , using hand and power tools .

这是一个特殊的领域，他们一般用手工和电动工具维护码头平台和管道。