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Lockdown drill
Lockdown drills are means of practicing preparedness in a business in the event of an intruder or criminal act. Generally an announcement is given that the building is going on an immediate lockdown. At that point, all occupants present at the time of the drill go to a room and lock all doors and windows tight. They must remain still until a "clear signal" has been issued. If the emergency is really life-threatening, then occupants present at the time of the emergency will evacuate to a meeting zone well away from the premises (scene of the emergency).
==Frequency==
Some schools, businesses, and agencies will conduct a lockdown drill yearly. Some schools may do a yearly lockdown drill as a replacement for or in addition to a fire drill.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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