采用氩弧局部强化可提高环槽的硬度和高温耐磨性。

Application of argon arc local strengthen can increase hardness and high-temperature wear resistance of the ring groove.

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利用微弧氧化技术对ZL 108铝合金活塞第一道环槽进行了陶瓷化处理。

The ceramic treatment for the first ring groove of ZL108aluminum alloy piston was conducted with micro-arc oxidation technique.

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倒挂的彩虹，或称“环天顶弧”，所以给它们这些正确的名称，并不是它们是由于下雨所造成的。

Upside down rainbows, or 'circumzenithal arcs', to give them the proper name, are not caused by rain.

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