今年夏天，密西西比州的一家监狱安装了一个叫做“信号门禁”(managed access)的装置。尽管波多黎各已对此装置的雏形进行过实验，但是在美国境内还是首次安装。
This summer one of Mississippi's prisons installed a system known as managed access-the first such installation in a mainland American prison, though a prototype has been tested in Puerto Rico.
今年夏天，密西西比州的一家监狱安装了一个叫做“信号门禁”（managed access）的装置。尽管波多黎各已对此装置的雏形进行过实验，但是在美国境内还是首次安装。
This summer one of Mississippi's prisons installed a system known as managed access—the first such installation in a mainland American prison, though a prototype has been tested in Puerto Rico.
包装内容：指纹安全门禁系统，安装转接环。
Package content: Fingerprint security access system. Mounting adapter ring.
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