The system has the ability to run more than one program at the same time.

该系统能够同时运行一个以上的程序。

《牛津词典》

Then, a computer system would often run one simple sequential program at a time, and nothing could interrupt it or vie with it.

那时， 计算机系统通常在同一时刻只能运行一个单独的程序，什么都不能打断它或者与它竞争。

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Once associated with a program entity, an attribute can be queried at run time and used in any number of ways (for example, help documentation).

属性一旦与程序实体关联，就可以在运行时查询它，并且可以以各种方式使用(例如，帮助文档)。

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