【机】 antifriction material
contend with; defy; fight; refuse; repel; resist
【医】 Adv.; contra-; ob-
abrade; burnish; grind; mill; milling; strop; whet
【医】 grinding; mill
data; datum; makings; material; stuff
【医】 data; datum; material; stock
【经】 material; materials; spoilage