名词
中文翻译：主要部分
同义词：
['backbone', 'backbone of the system']
例句：
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1. The main reason for his success is his hard work and dedication.
他成功的主要原因是他的勤奋和奉献。
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2. 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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3. The main problem with this approach is its complexity.
这种方法的主要问题是它的复杂性。