coarse abrasive
... coarse 粗的，未加工的，钝的 coarse abrasive 粗研磨剂(切片机刀磨刀用) coarse adjutment 粗调 ...
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他们也没能用粗拙地研磨剂来造出条纹来完成准确地几何证实。
Nor do they have the striations caused by a rough abrasive that could have been used to achieve the exact geometries they demonstrate.
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