How to make check points in a message passing system?

如何在一个消息传递系统进行检查？

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System to facilitate the selection of students and check points.

系统方便了学生选课和查分。

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While paying tickets, they must provide their personal payment information. They might also check points for their offense in a catalog.

在支付票费时，他们必须提供他们私人的支付信息。

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The police set up vehicle check points, and detectives went door to door in the vicinity looking for witnesses but were baffled that no one had reported the apparent victims missing.

WSJ: 'Abduction' Was a Prank, Police Find

Nigerians are increasingly questioning the police and military response, one that relies more on labor-intensive check points rather than intelligence operations that could provide tips on weapons or the composition of the group.

WSJ: Attacks in Nigeria Kill at Least 143

Most of these are caravans and prefabs, some smuggled in piecemeal past the army's check-points.

ECONOMIST: Israel