动词短语
中文翻译：主修
同义词：
['specialize in', 'focus on', 'concentrate on']
例句：
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1. She majorsin computer science at MIT.
她在麻省理工学院主修计算机科学。
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2.The engineer specializes in designing aircraft engines.
这位工程师专门设计飞机发动机。
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3. He focuses on improving the efficiency of his software development process.
他专注于提高软件开发过程的效率。