梭罗是十九世纪美国自然文学代表性人物，当代环保运动先驱。
Thoreau was a representative figure of American literature of nature in the 19th century and a pioneer in environmental protection.
亨利·戴维·梭罗是十九世纪美国自然文学作家和自然保护主义思想家。
Henry David Thoreau was a famous American nature writer and preservation thinker of the 19 ~ (th) century.
大多数美国大学坚持要求学生在选择专业之前，必须先学习自然科学、社会科学、语言和文学。
Most American universities insist that students sample natural and social sciences, languages and literature before choosing a field of concentration.
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