The accountant double-checked the addition on the invoice before sending it to the client.

會計師在把發票寄給客戶之前，再次核對了上面的加法計算。

A simple addition error caused the quarterly sales figures to look higher than expected.

一個簡單的加法錯誤，讓季度銷售數字看起來比預期還高。

Please verify the addition on your travel expense report before submitting it to finance.

提交差旅費報告給財務部之前，請先確認上面的加總是否正確。