降低

reduce; lower; decrease; cut; drop; downgrade; devalue; lessen; weaken; degarde; debase; cheapen; screw down; reduction; abasement; debasement; down; abasable

摩擦

friction; rubbing; chafe; rub; scrape; grate

损耗

wastage; loss; consumption; attrition; spoilage; deplete; consume; erode; fray; wear out; wear and tear