Therefore, the result returns only the addresses from the first instance because the element does not exist in the second instance.
因此，结果仅返回第一个实例中的地址，因为第二个实例中不存在元素。
That way, you can compare a column in the first instance of the table to the same column in the second instance, which allows you to compare the values in a column to each other.
这样，可将表的第一个实例中的列与第二个实例中的同一列相比较，这样可相互比较列中的值。
In the second instance, proper selling reduces the likelihood of incurring major losses.
第二，正确卖出可以减少遭受重大损失的可能性。
In the second instance, proper selling reduces the likelihood of incurring major losses.
第二，正确卖出可以减少遭受重大损失的可能性。
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