VOA慢速英语:研究称班级规模对学生成绩的影响很小

kindergarten – n. a school or class for very young children

bias – n. a strong and often unfair influence on someone or something

conclude – v. make an ending statement about something

achievement – n. something good that is achieved

randomly – adv. done or chosen without any play or system

score – n. the number of points received in a game or test

benefit – n. something that helps or provides an advantage

outcome – n. final result of a process or activity

substantial – adj. large in amount