However, in some small engines, the cylinder walls are plated with chromium, a very hard metal, to reduce wall wear and lengthen their life.

而对于一些小型发动机，气缸壁面镀铬，铬是一种硬度非常高的金属，可减少气缸壁的磨损并延长使用寿命。

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However, in some small engines, the cylinder walls are plated with chromium, a very hard metal, to reduce wall wear and lengthen their life.

而对于一些小型发动机，气缸壁面镀铬，铬是一种硬度非常高的金属，可减少气缸壁的磨损并延长使用寿命。

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