形容词
中文翻译：永久的
同义词：
['eternal', 'perpetual', 'everlasting']
例句：
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1. The river flows through the city for centuries without a break.
这条河穿越城市数百年，从未间断。
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2. The company's success is due to its commitment to sustainability.
该公司的成功归功于其对可持续性的执着。
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3. The legacy of this ancient civilization will continue to inspire future generations.
这个古老文明的遗产将继续激励未来的世代。