名词
中文翻译：长期
同义词：
['permanent', 'long-standing例句：1. The company has been in operation for over 50 years.（这家公司已经运营了50多年。）']
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.The project will take a long-term investment to complete.
这个项目需要长期投资才能完成。
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3.Long-term planning is essential for success.
长期规划对于成功至关重要。