名词
中文翻译：主要部分
同义词：
['core', 'backbone', 'axis']
例句：
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1. The main goal of the project is to improve efficiency.
项目的主要目标是提高效率。
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2. The main reason for their success was their strong teamwork.
他们成功的主要原因在于他们的团队协作。
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3.The main road leads to the city center.
主路通向市中心。