n.磨石,油石;
例句:
The finest edge is made with the blunt whetstone.
最好(锋利的)刀口是由钝的磨刀石磨成的.
Emulation is the whetstone of wits.
竞赛是智力的磨刀石.
Competition is the whetstone of talent.
竞争磨炼才能.