adj. beloid
... belock锁闭 beloid前窄后宽的 belongin应归入 ...
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该滤料的特点在于表层采用超细纤维层，滤料结构形成的流体通道呈现为前窄后宽。
The characteristics of this filter media are that the surface layer adopts microfibre and that the hydro-channels of the filter media's structure are narrow in the front and wide in the back.
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