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 bent easily.
这种材料非常坚硬，不容易弯曲。
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2. The team's leader is very rigid in his decision-making process.
团队的领导者在决策过程中非常固执。
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3. The new policy is intended to be rigid but also flexible enough to accommodate changes.
新政策旨在严格但也要灵活，以适应变化。