The idea of packing up functional units into nested objects is called Object Oriented Programming.
将功能单元打包成嵌套对象的想法称为面向对象编程。
英语百科
Wallace Pack Unit
The Wallace Pack Unit (P1) is a Texas Department of Criminal Justice (TDCJ) prison in unincorporated Grimes County, Texas, 5 miles (8.0km) south of Navasota. It is along Farm to Market Road 1227, in proximity to Houston.
It opened in September 1983 and is named after Wallace Pack, warden of Ellis Unit who was drowned in 1981.