So they try to untangle what is undiscernible or to determine what belongs to each of us.

所以他们企图拆开其是密可分西，并且设法区分分属我们个别西。

Obviously this method has every limited application in most instances, because of the impossibility or impracticability of segregating specific items as coming from separate purchases.

由于要辨认存货同买来源具体批次是，很明显个别计价法使用有很大局限性。