Through an inadvertence, the invoice was sent to the wrong client last Friday.

由於一時疏忽,上週五這張發票寄給了錯誤的客戶。

The missing signature on the contract was an inadvertence, not an attempt to mislead.

合約上漏簽名只是疏忽,並非有意誤導。

Due to an inadvertence by our booking agent, your hotel reservation was canceled.

由於我們訂房專員的疏忽,您的飯店預訂被取消了。