Therefore, we must cross this with another variable in an effort to isolate the effect.

因此，我们必须在比较过程中添加其他变量，避免出现这种结果。

youdao

Therefore, we must cross this with another variable in an effort to isolate the effect.

因此，我们必须在比较过程中添加其他变量，避免出现这种结果。

youdao