In the midday, when the gnomon's shadow was cast over the stone plate, they could read the length of the shadow directly from the ruler.
正午时，表影投在石板上，古人就能直接读出表影的长度值。
The stone plate was perfectly round.
那个石板非常圆。
The invention relates to a stone plate, which comprises the following parts: thin stone plate, strip groove on the back of thin stone plate, rib reinforcement inserted in the strip groove.
一种石质板材，包括一石材薄板，在该石材薄板的背面设有条形沟槽，该条形沟槽内嵌设有加强筋。
The invention relates to a stone plate, which comprises the following parts: thin stone plate, strip groove on the back of thin stone plate, rib reinforcement inserted in the strip groove.
一种石质板材，包括一石材薄板，在该石材薄板的背面设有条形沟槽，该条形沟槽内嵌设有加强筋。
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