名词
中文翻译：长期
同义词：
['long-term', 'permanent', 'lasting']
例句：
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1. The company has been in operation for over 50 years.
这家公司已经运营了50多年。
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2. He has lived in this city for more than ten years.
他已经在这个城市生活了十年以上。
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3. The project will take a long-term approach to ensure its success.
这个项目将采取长期的方法以确保其成功。