NET的内存保护功能对于数控系统的稳定性具有重要意义；
NET has memory protecting function which is crucial to the stability of CNC system.
PDP-15 兼容早期的 PDP-9 并包括各种高级功能，包括内存保护和浮动点。
The PDP-15 was compatible with the earlier PDP-9 and included various advanced features, including memory protection and floating points.
Copland始于上世纪90年代，“新一代”是指支持内存保护和抢先式多任务，当时的Mac OS不支持这两项功能。
In the 1990s, when Copland was initiated, "next-generation" meant supporting memory protection and preemptive multitasking, both of which classic Mac OS lacked.
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