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In a terrorist attack, we should stay calm and remember RUN-HIDE-FIGHT. The design is on the “HIDE” to strengthen the protection of the people.
When people meet a terrorist attack can't escape, open the lid of it, and press the button, the smoggy hidden will spit out a lot of smoke, then smoke can help people avoid gangsters, so delay the time, waiting for rescue.
Huazhong University of Science & Technology