求翻译：不过，在某种特殊的操作条件下，轴承可以获得较长于传统计算的寿命，特别是在轻负荷的情况下。这些特殊的操作条件就是，当滚动面（轨道及滚动件）被一润滑油膜有效地分隔及限制污染物所可能导致的表面破坏。事实上，在理想的条件下，所谓永久轴承寿命是可能的。是什么意思？

However, in some kind of special operating conditions, can more for longer than the traditional calculation of bearing life, especially under light load conditions. Operation of these special conditions is, when the rolling surface (rail and rolling) is a lubricating oil film effectively separates and limit pollutants can cause surface damage. In fact, in ideal conditions, the so-called permanent bearing life is possible.