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。
The hanging bar is a long and thin light-wall conduit. The folding clothes hanger is composed of two relative folding arms.
挂杆为一细长、薄壁管，可折叠衣撑由相对的两个折叠臂组成。
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