个别的

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实是密不可的东西，并且设法区们的东西。

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.

由于要辨认存货不同买来源的具体批次是不现实的，很明计价法的使用有很大的局限性。