名词
中文翻译：主要部分
同义词：
['core', 'essential', 'principal']
例句：
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1.The main part of the project is to design the new building.
项目的主要部分是设计新建筑。
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2.The main part of the problem was that the machine broke down.
问题的主要部分是机器出了故障。
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3. The main part of the speech was about the importance of education.
演讲的主要部分是关于教育的重要性。