Most often the drainage holes run through both the filter belt and the bottom guides.
大多数情况下，排水孔都穿过过滤带和底导规。
Many filtration belts have guides on the bottom of the belt to keep the drainage holes centered over the vacuum Chambers or to aid in tracking.
很多带式过滤器在带子底部划有指引线，用以保证排水孔中心在真空室中病辅助跟踪。
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