形容词
中文翻译：坚硬的
同义词：
['stiff', 'unyielding', 'rigidly']
例句：
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1. The material is extremely rigid and cannot be bent easily.
这种材料非常坚硬，不容易弯曲。
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2. She was a rigid rule-follower in her office.
她在办公室里是一个严格遵守规则的人。
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3. The dam is designed to hold back the floodwaters with its rigid structure.
大坝的设计是为了用其坚固的结构阻挡洪水。