Top tension risers (TTRs) are used as the conduits between dynamic floating production units and subsea systems on the sea floor, for drill, complete or production facilities.

顶部张紧立管（TTR）是用于连接运动的浮式生产设施和海床上的海底系统的管道，顶部张紧立管可用于钻井、完井及生产。

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Petroleum and natural gas industries - Design and operation of subsea production systems - Part 1: general requirements and recommendations.

石油和天然气工业。海底作业系统的设计和操作。第1部分：一般要求和推荐标准。

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The result shows that, this area develops several sedimentation systems including alluvial fan, fan delta, subsea apron, delta, channel and lake and volcanic rock body.

结果表明：该区下白垩统主要发育冲积扇、扇三角洲、水下扇、三角洲、河道、湖泊等多种沉积体系及火山岩体。

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In 2011, about 40% of its revenue came from the sale of capital products such as crane systems or unmanned submarines for a range of projects, including building new drilling rigs or subsea construction.

WSJ: Trio of IPOs Have Mixed Debuts