美国山核桃是起源于美国的主要坚果树种，全世界百分之八十的山核桃产量来自于美国。
Pecans are the only major tree nut native to the U. S., which produces about 80 percent of the world's crop.
美国山核桃是起源于美国的主要坚果树种，全世界百分之八十的山核桃产量来自于美国。
Pecans are the only major tree nut native to the U.S., which produces about 80 percent of the world's crop.
从研究角度而言，和平学主要起源于欧洲国家，但大部分和平学课程却首先出现在美国。
With its origin in Europe, Peace Studies find most of its curricula coming into shape in America.
牛津英语字典解释“沙发土豆”起源于一美国俚语，表示“一位身着燕尾服的人消极地或懒散地坐着度过悠闲的时光，主要是看电视或录像带”。
The OED says "couch potato" originated as American slang, meaning "a pennon who spends leisure –time passively or idly sitting around, especially watching television or video tapes" .
牛津英语字典解释“沙发土豆”起源于一美国俚语，表示“一位身着燕尾服的人消极地或懒散地坐着度过悠闲的时光，主要是看电视或录像带”。
The OED says "couch potato" originated as American slang, meaning "a pennon who spends leisure –time passively or idly sitting around, especially watching television or video tapes" .
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