形容词
中文翻译：Unknown
同义词：
['stubborn', 'resolute', 'firm', 'uncompromising']
例句：
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1. He has a strong personality and is not easily persuaded.
他性格坚强，不易被说服。
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2. The company adopted a tough strategy to compete in the market.
该公司采取了强硬的策略来在市场上竞争。
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3. The government's policy on environmental protection is very firm.
政府对环境保护的政策非常强硬。