运动员和科学家早就知道，用餐时间会影响成绩。
Athletes and scientists have long known that meal timing affects performance.
成就目标和社会目标是课堂目标影响成绩的中介变量。
Academic achievement and social goals were mediators between classroom and academic achievement.
其它的因素也会影响成绩，如：这学期的进步相对于退步，相对于初级程度是否进步。
Other factors may come in to play, eg: improvement versus stagnation over the semester, and progress relative to starting level.
其它的因素也会影响成绩，如：这学期的进步相对于退步，相对于初级程度是否进步。
Other factors may come in to play, eg: improvement versus stagnation over the semester, and progress relative to starting level.
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