Strong affinity, teaching lively, broad knowledge scope.
具有较强的亲和力，讲课生动活泼，知识面宽广；
A doctorate program is offered in a particular field and a specialty within the field because the scope of knowledge today is so broad and constantly growing.
博士学位是设置在特定的领域里，在这领域里，又有一个特别的专业，因为今天的知识范围太广，而且不断扩大。
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