If one of these objects survives long enough to be moved into tenure space before becoming unreachable, it could be a long time before a tenure collection runs and "realizes" that the object is dead.

如果这两种对象存活的时间足够长，在变得无法访问之前被移动到保留区空间中，那么可能会经过很长时间以后才会运行保留区收集，“发现”这个对象已经死亡。

youdao

These errors can occur if the data sources are unreachable or invalid.

如果数据源不可访问或无效，就会出现这些错误。

youdao

If an object cannot be found by tracing the root trees, then that object is unreachable and therefore can be reclaimed by the GC.

如果一个对象不能通过跟踪根树来找到，那么对象是不可到的，它可以被GC再生。

youdao

But there's no guarantee the trickle won't become a flood if Jordan in the south or Turkey in the north become unreachable.

NPR: Israel Fears End To 40-Year Peace On Syrian Front