| 单词 | toughen |
| 释义 | toughen 1 ENTRIES FOUND: toughens; toughened; toughening toughens; toughened; toughening Learner's definition of TOUGHEN 1 : to make (something) stricter or to become stricter(使)更严厉 [+ object]
[no object] — usually + up
2 : to make (someone) physically or emotionally stronger or to become physically or emotionally stronger(使)更坚强 [+ object]
[no object] — usually + up
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