To sum up the experience of these situations timely, it is of great practical significance for citizens' order participation in the public policy establishment.

对这些经验进行及时的总结，对于我国公共政策中的公民的有序参与具有一定的实践意义。

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"So there may be situations in which the taking of photographs may cause or lead to public order situations, inflame an already tense situation, or raise security considerations, " it said.

BBC: Is it a crime to take pictures?

"Helicopters are a valuable tool for police in our normal operations, including investigations, anti-crime operations, traffic management, search and rescue, public order situations, crime reduction initiatives and tackling terrorism, " she said.

BBC: PSNI to build helipad in Enniskillen police station