To avoid having to replace shafts running in severely abrasive conditions, it may be desirable to press on to them easily replaceable hardened ring for the lips of the seal to bear on.
为了避免以取代竖井中运行严重磨损条件下，它可能是可取的新闻界对他们易于更换硬化环嘴唇的印章产生影响。
To avoid having to replace shafts running in severely abrasive conditions, it may be desirable to press on to them easily replaceable hardened ring for the lips of the seal to bear on.
为了避免以取代竖井中运行严重磨损条件下，它可能是可取的新闻界对他们易于更换硬化环嘴唇的印章产生影响。
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