求翻译：而且使真空灭弧室外表面不受外部机械力和外部环境（如灰尘，潮气，污秽，小动物）的影响，进一步改善了极柱的电场分部的状况，在使用寿命内是完全免维护的，代表了当今世界中压真空断路器设计和制造的先进水平。是什么意思？

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But the vacuum fight arc outdoor surfaces are not subject to external mechanical and external environment, such as dust, moisture, impurity and small animals) To further improve the impact the very pillars of the electric field, the situation is completely free of maintenance within the lifetime of

Moreover causes the vacuum explosion chamber outside surface not exterior mechanical power and the external environment (for example dust, humidity, contamination, micro-organism) the influence, further improved the terminal post electric field branch's condition, exempts the maintenance completely

And make the vacuum interrupter outdoor surface from external mechanical force and external environment (such as dust, moisture, pollution, small animals) effect, further improve the situation of poles of the electric field Division, within the service life is completely maintenance-free, represent

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