形容词
中文翻译：坚硬的
同义词：
['stiff', 'unyielding', 'inflexible']
例句：
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1. The material is very rigid and cannot be easily bent.
这种材料非常坚硬，不容易弯曲。
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2. The team's performance was rigid and lacked flexibility.
团队的表现非常僵硬，缺乏灵活性。
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3. The new policy is designed to address the rigidity of the old system.
新政策旨在解决旧系统的僵硬性。