The variable-ratio schedule is often used in classrooms to reward students unpredictably for correct answers.
变率程序式常用于课堂中，对学生正确答案进行不可预测的奖励。
Students tend to respond more actively to a variable-ratio schedule because of the intermittent reinforcement.
由于间歇性强化，学生更倾向于对变率程序式做出积极反应。