- hard spots
- 部分: part; section; portion
- 过硬: have a perfect mastery of st ...
- 过硬: have a perfect mastery of sth.; be really up to the mark; be able to pass the stiffest test 过硬本领 be perfect at a skill; 过硬操作技术 a perfect mastery of operational technique
- 过硬的: overhard; superhard
- 过硬化: overvulcanization
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