noun · The flat slab forming the uppermost part of a column capital in architecture.

这个古希腊圆柱的顶板上刻有精美的花纹。

noun · The rock layer or stratum forming the ceiling of a mine, cave, or underground excavation.

矿工在作业时必须时刻注意顶板的安全，防止塌方。

noun · The top structural slab or roof plate of a building, tunnel, or other construction.

工程师正在检查地下室顶板的钢筋排布。