Please never leave your laptop unguarded in the hotel lobby during the conference.

研討會期間，請絕對不要把筆電放在飯店大廳無人看管。

The shipment sat unguarded on the loading dock overnight, and two boxes went missing.

那批貨整晚放在裝卸區無人看守，結果少了兩箱。

Security staff noticed the server room door was unguarded after the evening shift ended.

保全人員發現晚班結束後，機房的門無人看守。