If you live in a ground floor apartment, the windows should be covered by bars or grates to prevent unwanted intruders from entering through the windows. (rentersinsurance.net)
Key immune cells involved in causing this damage are macrophages (literally «big eaters»), which ordinarily serve to attack and rid the body of unwanted intruders. (sciencedaily.com)
Multi-function doors provide the fire safety required by law and double up as security doors to protect against unwanted intruders. (thefashionablehousewife.com)