You can take something that's magnetic with a north-south 1 magnetization and just say arbitrarily, this will represent one.

你只需要一个北南极的磁性物体,任意指定，比方说代表。

哈佛公开课 - 计算机科学课程节选

Already by 1825--that early the South was the world's largest supplier of cotton and fueling now this Industrial Revolution in textile production in Great Britain and other places.

截至1825年,南方是全世界,最大的棉花供应者并且促进着,在英国和其他国家的,纺织工业的发展

耶鲁公开课 - 美国内战与重建课程节选