The underestimation was systematic: When adding two numbers, the monkeys always paid attention to the larger of the two, and then added only a fraction(小部分)of the smaller number to it.
这种低估是系统性的: 当猴子加上两个数字时, 它们总是注意两个数字中较大的一个, 然后只添加较小数字的一小部分。
2019全国卷3