动词
中文翻译：精通
同义词：
['proficiency', 'proficiency in', 'be proficient in']
例句：
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1. He is very skilled at playing the guitar.
他非常擅长弹吉他。
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2. She has become proficient in her new language within a year.
她在一年内熟练掌握了新语言。
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3. The engineer was proficient in designing complex systems.
这位工程师在设计复杂系统方面非常熟练。