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 purpose of the meeting was to discuss the budget.
会议的主要目的是讨论预算。
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2. The main problem is that we need more resources.
主要问题是我们需要更多的资源。
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3. The main focus of the research was on the effects of exercise on health.
研究的重点是运动对健康的影响。