形容词
中文翻译：长期的
同义词：
['long', 'lengthy', "long-standing例句：1. I've been working on this project for a long time.（我已经在这个项目中工作了很长时间。）2. The company has been in business for over 50 years.（这家公司已经经营了50多年。）"]
例句：
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1. I've been working on this project for a long time.
我已经在这个项目中工作了很长时间。
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2. The company has been in business for over 50 years.
这家公司已经经营了50多年。
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3.We have known each other for a long time.
我们认识已经有很长一段时间了。