The negative carbon brush damage often occurs in operation.

运行中负极电刷易受损伤。

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Damage often occurs slowly, with peripheral vision affected first, and many sufferers do not realise there is a problem until their sight is badly affected.

这种损害进展缓慢，先是影响周边视力，许多患者通常在最初不能意识到眼睛的问题，直到视力收到严重损害才被发觉。

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The liver is often able to repair and heal itself following injury or damage and this occurs in one of three ways.

肝脏通常能在损伤或损害后通过三种方式中的一种进行修复和治疗。

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