每个公司都控制着油田中一定土地上的开采权，并由股份的比例把资金投入到管道建设中。
Each company controlled oil rights to particular shares of land in the oil fields and paid into the pipeline construction fund according to the size of its holdings.
考克斯先生说去年春天一场暴风雨之后他坐直升机飞过爱荷华州的部分地区发现未受到保护的土地上在冲刷后已经形成了一些深沟，这些深沟成了土壤表层流失的管道。
Mr. Cox said that he flew over parts of Iowa in a helicopter last spring after a severe storm and found that deep gullies had formed in unprotected farmland, becoming conduits for soil runoff.
地上和地下管道，阀门，排水渠，控制器和电线在一个景观灌溉系统的所有元素。
Underground and aboveground pipes, valves, drains, controllers and electrical wiring are all elements in a landscape irrigation system.
应用推荐