名词
中文翻译：主要调查
同义词：
['major investigation', 'primary investigation例句：1. The main investigation is focused on the effectiveness of the new policy.（主要调查集中在新政策的效果上。）']
例句：
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1. The main investigation is focused on the effectiveness of the new policy.
主要调查集中在新政策的效果上。
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2.The team conducted a major investigation into the cause of the accident.
该团队对事故原因进行了一项主要调查。
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3. The company's main investigation revealed several areas for improvement.
公司的初步调查揭示了几个需要改进的领域。