They were carded by the police guard at the entrance.

入口处的门卫要他们出示身份证。

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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。

youdao

At Indira Gandhi, four armed police stood guard at each entrance, and people waiting for arriving passengers were not allowed inside.

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Police stood guard at the entrance of Washington Square Park, sending protesters spilling out into nearby streets.

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He is now 15 years old and attends a New York City public high school where two armed police officers stand guard at the entrance and students need to go through a metal detector every day as they enter the building.

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