The principle of operation, trough-line parameters and mechanical characteristics are introduced. Its application in stone mines is introduced.

介绍了风动潜孔刻槽机的工作原理、槽线参数和机械特征，及其在石材矿山的应用情况及发展前景。

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The rough waters in the trough scatter light in all directions, forming a dark line.

谷底汹涌的水体将光散射到各个方向，形成了一条暗线。

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Using Imported Prepreg as the Raw Material, the Second Overall Compression Molding for External Trough Line and the Tube, Excellent Surface Finishment and Mechanical Performance.

采用进口预浸布作为原材料，槽线与管体二次固化整体成型，表面光洁度和力学性能优异。

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Furthermore, we believe the DVD (and broader optical disk) category has already entered a long-term decline (analogous with peak-to-trough decline of VHS and CD categories), caused by rapid growth in on-line streaming and a la carte rentals (though we admit that UV has been a bit of a disappointment, so far).

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The old guard of hanger-ons and consultants once again line up at the trough.

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Consumer spending, which makes up about 70% of the U.S. gross domestic product, is expected to be about in line with its activity last year, which had more pent-up demand and a larger trough to climb.

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