名词
中文翻译：专长
同义词：
['specialization', 'expertise', 'specialism']
例句：
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1. He has a strong proficiency in English.
他英语水平很高。
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2. She has developed a unique proficiency in her field.
她在她领域里发展出了独特的专业技能。
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3. The expert in this field has made significant contributions to the field's advancement.
这个领域的专家对领域的发展做出了重大贡献。