This coat is made of coarse material.
这件外套是用粗糙的衣料做的。
The material surface coarse, coating can't cover serious level.
素材表面严重粗糙，镀层无法覆盖平整。
Coarse and uniform sand, as filtering material, could prevent filtering material loss and agglomeration.
粒径较粗且均匀的河沙滤料的使用，避免了滤料的大量流失和滤料结块。
Coarse and uniform sand, as filtering material, could prevent filtering material loss and agglomeration.
粒径较粗且均匀的河沙滤料的使用，避免了滤料的大量流失和滤料结块。
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