动词
中文翻译：锻炼
同义词：
['harden', 'sharpen', 'hone']
例句：
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1. She has been working hard to improve her skills.
她一直在努力提高自己的技能。
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2. The journey was tough, but it helped him grow as a person.
这次旅行很艰难，但它帮助他成长为一个更好的人。
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3. He is known for his ability to work through difficult situations and emerge stronger.
他以能够克服困难并变得更强大而闻名。