After my vacation, I came back to a mountain of unread emails in my inbox.

休假回來後，我的收件匣裡堆了一大堆未讀郵件。

The accounting team is working late to clear a mountain of unpaid invoices.

會計團隊正在加班，處理一大堆未付款的發票。

Our warehouse has mountains of returned packages waiting to be processed this week.

我們的倉庫本週有大量退貨包裹等待處理。