英文關鍵字
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angle
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base
blocking
border
boundary
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clear
concrete
conflict
course
crime
criminal
danger
district
emigration
fence
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format
geographical
government
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gripping
guarding
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horizontal
immigration
investigation
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location
lockdown
low
metal
military
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obstacle
outdoors
part
passing
people
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prison
privacy
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real
reliability
residential
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security
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system
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