bì / qū / jiān / shàng / de / lián / xù / hán / shù / yī / dìng / yǒu / zuì / dà / zhí / hé / zuì / xiǎo / zhí

闭区间上的连续函数一定有最大值和最小值。

A continuous function on a closed interval must have a maximum and a minimum value.