I inadvertently replied to all, so the whole department saw my personal note.

我不小心按了全部回覆，結果整個部門都看到了我的私人留言。

The warehouse inadvertently shipped the order to our old address in Kaohsiung.

倉庫無意中把訂單寄到了我們在高雄的舊地址。

The agent inadvertently charged the customer twice and quickly issued a full refund.

客服人員不慎向顧客重複收費，隨即辦理了全額退款。