toughness

中英例句：

1. She has an unusual degree of self-reliance and mental toughness.
   她有非凡的自立的精神和堅韌不拔的精神。
2. All this toughness does not sit well with everyone.
   所有這種強硬的做法並非人人都能接受。

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英文解釋：

名詞 toughness:

1. enduring strength and energy
   同義詞：stamina, staying power
2. the property of being big and strong
   同義詞：huskiness, ruggedness
3. the elasticity and hardness of a metal object; its ability to absorb considerable energy before cracking
   同義詞：temper
4. impressive difficulty
   同義詞：formidability