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1855年,美国休伦港市郊一所小学的教室里,数学教师恩格尔在上课,他每教一样,学生们跟着应和一样:“一加一等于二。”“一加一等于二。”“二加二等于四。”
In 1855, in the classroom of a primary school on the outskirts of Port Huron in the United States, mathematics teacher Engel was in class. As he taught, the students followed the same principle: “one plus one equals two.” “One plus one equals two.” Two plus two equals four. "