具有特殊技能或知识，尤指学术上或职业上的分区，与其他分区相联系但又有区别。
An area of specialized skill or knowledge, especially academic or vocational, that is related to but separate from other areas.
具有特殊技能或知识，尤指学术上或职业上的分区，与其他分区相联系但又有区别。
An area of specialized skill or knowledge, especially academic or vocational, that is related to but separate from other areas.
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