名词
中文翻译：Unknown
同义词：
['leader', 'chief', 'manager', 'president', 'prime minister', 'chairman']
例句：
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1. The CEO of the company is expected to make a significant announcement tomorrow.
公司首席执行官预计将于明天做出重大宣布。
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2. The prime minister has been in office for over two decades.
总理已经执政超过二十年了。
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3. The chairman of the board is considering new strategies for the company's growth.
董事会主席正在考虑新的策略以促进公司的增长。