The particular action which reserves portions of computing systems(usually memory units) for specific purposes. Reservations of space, locations, etc. are often permanent for the duration of specific programs.

• 为特定目的而配给计算机系统资源（通常是存储单元）的特定动作。所配给的空间、存储单元等在特定程序执行期间常常是不改变的。