未来的研究需要更多的考虑第三变量。
The third variable(for instance, physical self-esteem) should be considered in future studies.
第三变量指影响另外两个变量之间关系的变量，即调节变量和中介变量。
The third variable, for instance, a moderator or a mediator, is a variable that influences relationship between another two variables.
在选择该第一变量值(B)具有其第一值且使该第二及第三变量(C, D)具有其实际值的情形下，执行该函数。
The function is run with the first variable value (b) selected as having its first value, and with the second and third variables (c, d) having their actual values.
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