形容词
中文翻译：坚硬的
同义词：
['stiff', 'inflexible', 'rigid']
例句：
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1.The metal is very rigid and cannot bebent easily.
这金属非常坚硬，不容易弯曲。
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2. The new laws are very rigid andwill not be easily changed.
新法律非常严格，不会轻易改变。
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3. The road is veryrigid and it's difficult to driveon it.
这条路非常硬，很难在上面行驶。