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美国核禁区为免受恐怖分子的偷袭而使用的一项技术，能准确地测出躲藏在卡车或集装箱内企图偷渡人美的非法移民。被设计者称为“未来之门”的封闭空间探测系统（ESDS），经改进后被海关用来扫描车辆，可检测出藏在车里的人，并能发现隐藏的炸药和放射性原料。当汽车驶入或开出
A technology used by the U.S. nuclear-restricted area to protect themselves from terrorist attacks accurately detects illegal immigrants hiding in trucks or containers trying to stow Americans. The Enclosed Space Detection System (ESDS), designed by the architect as the “Gate of the Future,” was later upgraded by the Customs to scan vehicles to detect people hiding in the car and to detect hidden explosives and radioactive materials. When the car goes in or out