以下为句子列表：
英文: It could be that the computer simulations are somehow faulty, but it is also possible that the analogy with pipe flow is simply incorrect and that rotating systems like accretion disks are intrinsically different.
中文: 可能是电脑模拟错了，但也可能是以管中流体来类推，基本上就不正确，像吸积盘这种旋转系统的性质本就与之不同。
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英文: The selection of pipe wall thickness, the calculation and design key points of the melt flow, melt pipe flow pressure fall and melt flow speed in the design of melt pipes were introduced in detail.
中文: 摘要介绍了熔体管道设计中管道壁厚选择、熔体流量、熔体管道流动压力降和熔体流速等计算方法和设计要点。
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英文: Valves should be installed in the (stem) vertical position with the pipe flow horizontal only. For installations other than this, please consult factory when ordering.
中文: 阀门应该只能安装在水平流向的管线上，其阀杆应该垂直向上。如果需要其它方式的安装，请在订购阀门时咨询工厂。
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