切割金属时,可以看到光亮的表面,但是立刻就变成了灰色。
When metals are cut, the shining surface is visible, but it turns grey almost immediately.
切割金属时,可以看到光亮的表面,但是立刻就变成了灰色。
When metals are cut, the shining surface is visible, but it turns grey almost immediately.
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