Two security officers guard the server room around the clock to prevent data theft.

兩名保全人員全天候守衛伺服器機房，以防資料遭竊。

Please guard your boarding pass and passport carefully while waiting at the crowded gate.

在擁擠的登機門等候時，請妥善保管好您的登機證和護照。

The warehouse hired extra staff to guard incoming shipments during the holiday rush.

倉庫在假期旺季額外聘請人手，看守進貨的貨物。