unreachable

Objects that are unmarked at the end of the mark phase are unreachable by the application (dead) because there's no path from the root set through any series of references to find them.

标记阶段最后也没有标记的对象是应用程序不可获得的对象（死对象），因为不存在从根集经过任何引用序列找到这些对象的路径。

Russell said he couldn't get answers about his own treatment, and the man who once spent so much time offering care and advice was unreachable.

拉塞尔说他不能从自己的治疗中得出答案，并且这个曾经花费许多时间提供关心和建议的人是遥不可及的。