A solemn pagoda is keeping guard for the desolate plateau.

庄严的佛塔，固守着这片苍凉的高原。

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While two detectives were keeping guard at the door, two others opened the parcel.

这时两个侦探把住门口，另外两个侦探打开了包裹。

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They are such precious stones that the police are keeping guard at every entrance.

它们是极珍贵的宝石， 所以警察在各个入口严防死守。

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My best guess is that managing and mitigating risk was the primary focus of the Thompson-led PayPal, and while Marcus is certainly concerned with keeping the guard up where necessary, he recognizes that there are better ways to communicate what's happening, why it's happening and how PayPal is there to make life easier.

ENGADGET: An interview with PayPal president David Marcus: as offline / retail prominence grows, a renewed focus on customer service

Thank you, Secretary Napolitano, for your introduction, but more importantly, your outstanding leadership in keeping our homeland secure and -- along with Admiral Papp -- keeping our Coast Guard strong.

WHITEHOUSE: U.S. Coast Guard Academy Commencement

Italian Coast Guard officials said emergency generators were keeping the ship's control room illuminated and communications equipment such as radios running.

WSJ: Towing Begins for Costa Cruise Ship Adrift After Fire