Advanced placement, if you add extra layers of lacquer to the surface of a bat, you can make the wood almost as hard as metal, and really hit that ball.
更进一步的舞弊方式，如果你在球棒表面多上一层漆，球棒的硬度就几乎可以媲美金属，可以将球击得老远。
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The lacquer film on the rubber belts was hard to remove, so the belts were repeatedly damaged.