In particular, the interaction between the main actor and the system involves a boundary class.
尤其是主要参与者与系统的交互，其包含了边界类。
It strikes freely and willingly. It cuts across every boundary you can imagine. It pays no mind whatsoever to race, age, or class.
我们可以自由自愿地反对性暴力，甚至超越了任何你可以想到的界限，不论你是属于哪个种族、多大年纪或是来自哪个阶层。
Some universities, for example, identify a "border region" of marks just below a class boundary in which a board of examiners is permitted to move a student up to the next degree class.
比如说，一些大学会定义一个略低于分级分数线的“边界区域”，允许该分数领域内的学生升级进入分数线两侧高一级的档次。
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