名词
中文翻译：长期时期
同义词：
['duration', 'span', 'interval']
例句：
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1.The company has been in operation for over a hundred years.
这家公司运营了一百多年。
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2.This project will take a long period of time to complete.
这个项目需要很长时间才能完成。
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3. During the long period of the Great Wall's construction, many people worked on it.
在长城修建的漫长期间，许多人参与了建设。