名词
中文翻译：事情的核心
同义词：
['core', 'essence', 'crux例句：1. The heart of the matter is that we need to find a solution quickly.（事情的关键在于我们需要迅速找到解决方案。）2. The teacher pointed out the heart of the matter in the lesson.（老师在课上指出了这个问题的核心。）']
例句：
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1. The heart of the matter is that we need to find a solution quickly.
事情的关键在于我们需要迅速找到解决方案。
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2. The teacher pointed out the heart of the matter in the lesson.
老师在课上指出了这个问题的核心。
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3. The meeting was about the heart of the matter - how to improve our performance.
会议的主题是如何解决我们的表现问题。