What does "a line of trenches" mean?, watch towers, border gates, dug ditches, road blocks, What is "barbed wire"?, border sign, sharp fencing, metal gate, stone wall, What does "control human movement across the border" mean?, move soldiers, build tunnels, open checkpoints, regulate crossing, What is an "early warning system"?, danger detector, peace treaty, travel permit, border map, What does "free movement back and forth" mean?, forced return, strict patrols, easy travel, closed crossing, What does the phrase "good fences make good neighbours" suggest?, clear boundaries, weaker security, open borders, shared property, What does "keep people out" mean?, invite visitors, guide refugees, check documents, prevent entry, What are "motion sensors"?, metal fences, movement detectors, border cameras, alarm codes, What is a "physical deterrent"?, visible obstacle, army vehicle, peace message, legal document, What are "round-ups of undocumented migrants"?, border checks, aid programs, visa approvals, mass detentions, What does "security build-up along the border" mean?, trade growth, more protection, open access, fewer guards, What is "the border area"?, capital city, battle plan, frontier zone, sea route, What is "thermal imaging"?, heat detection, map reading, night driving, radio tracking, What does "to allocate resources" mean?, close routes, remove troops, sign contracts, assign supplies, What does "to escalate tensions" mean?, restore peace, reduce patrols, increase conflict, cross safely, What does "to halt cross-border traffic" mean?, speed transport, stop crossings, open highways, move migrants, What does "to increase defensive capabilities" mean?, strengthen defense, share weapons, weaken borders, lower costs, What does "to infiltrate the enemy territory" mean?, defend openly, enter secretly, guard civilians, retreat quickly, What does "to make smuggling easier to spot" mean?, reduce patrols, hide routes, help smugglers, improve detection, What does "to put up fences" mean?, dig tunnels, open borders, build barriers, remove walls, What does "to restrict enemy mobility" mean?, limit movement, train soldiers, supply weapons, expand territory, What does "to smuggle goods across the border" mean?, trade fairly, check cargo, tax products, transport illegally, What does "to tear down the fence" mean?, repair damage, remove barrier, raise security, paint metal, What does "to use thermal imaging" mean?, record sound, count vehicles, detect heat, draw maps, What does "wall off two countries" mean?, share borders, open crossings, join politically, separate physically.

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