When a catalyst plug passes through the conduit it blocks the light path and thus the light intensity recorded by the detector drops.

当催化剂栓柱通过管道时，它遮断光路，因此检测器记录下的光强降低。

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Provide a taper plug gauge for all contour blocks gap measuring.

提供一把缝隙尺以检测产品与模拟块的间隙。

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At lockups, news organizations have been required to plug their computers into a device called a "black box" tied to a central switch, which blocks computer transmissions until the embargo lifts.

WSJ: U.S. Probed Media Firms on Data Reporting