The bird pecked through the thin board at the bottom of its cage.

那只鸟啄穿了笼子下的薄底板.

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Secondly, discretion formula of roof destruction is obtained by simplifying roof strata to elastic thin board.

其次将分段开采后顶板岩层简化为四边固支的弹性薄板,得出了顶板破断的判别式.

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It is especially effective in polishing the granite, thin board, ground ceramic brick and micro - crystal stone.

对花岗石大板 、 薄板 、 地瓷砖及微晶石的磨削抛光效果极佳.

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