The UNIX design consists of hundreds of function calls (called system calls) covering simple tasks, such as displaying a character string on the screen to setting task priorities.
UNIX 的设计由大量的函数调用（称为系统调用）组成，其中包括一些简单的任务，如在屏幕上显示字符串来设置任务优先级。
The design of the new nodes makes migration from other solutions a simple task
新节点的设计使得从其他解决方案迁移成为非常简单的任务
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