专业specialization; specialized profession
个used before nouns without fixed measure words of their own; used between a verb and its object
出proceed from inside to outside; appear
历史process of the development of Nature and the human society; past records
外outside; of one's mother, sisters or daughters
多much; exceed the expected/intended quantity
姐姐elder sister; girl or woman who is of the same generation but older in age
当然certainly; natural: naturally
物理innate laws of things; physics
行go; something about travelling
课examine; learn or give a lecture