麻烦的是，随着顾客的购买库存减少了，还有退货以及追加订货等情况，所以货物的清单经常地发生变化。

Complicating matters is the fact that inventory is constantly changing, with customer purchases depleting stock, and returns and reorders adding to it.

youdao

麻烦的是，随着顾客的购买库存减少了，还有退货以及追加订货等情况，所以货物的清单经常地发生变化。

Complicating matters is the fact that inventory is constantly changing, with customer purchases depleting stock, and returns and reorders adding to it.

youdao