名词
中文翻译：Unknown
同义词：
['profession', 'specialty']
例句：
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1. He has a professional background in finance.
他在金融领域有专业的背景。
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2. She specializes in teaching English as a second language.
她专门教授英语作为第二语言。
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3.The doctor's specialty is in treating heart disease.
这位医生的专业是治疗心脏病。