名词
中文翻译：硬的
同义词：
['hard', 'solid', 'tough', 'stiff']
例句：
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1. The hard rock formation is a wonder of nature.
坚硬的岩石形成是一种大自然的奇观。
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2. The hard work paid off in the end.
艰苦的工作最终得到了回报。
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3. The hard disk drive has been a reliable storage device for years.
硬盘驱动器多年来一直是可靠的存储设备。