Working state of a screw pump rod-line is analyzed using Finite element analysis method during broken working station, and three kinds of possible mechanical models are set up.

如何降低螺杆泵抽油杆的应力水平，提高工作寿命是石油开采设备研究中一个急需解决的力学问题。

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At one point, one man, not Inupiat, posed beside the whale holding a small fishing rod, pretending for a camera that he had caught it on eight-pound line.

在某一处，一个男人，不是一位爱斯基摩人，在鲸旁边握着钓竿摆了个POSE，他抓着一台相机伪装在8英磅的线上。

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I can overcome a lot of things by using a longer rod with slightly heavier fluorocarbon line because fluorocarbon is far less visible.

用长一点的竿子和粗一些的碳线(因为氟碳线在水中的可视性很小)，我可以克服很多的困难。

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