If that coordinate is at the given level or below, then the tile is coloured blue, otherwise it is left transparent.

如果那个点等于或低于给定的海拔高度，则那块贴图就标为蓝色，否则就还是透明的。

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This article discussed the selection of the raw materials and the pasted technique of the transparent GRP sheet (tile).

就透明玻璃钢板(瓦)的原材料选用、糊制工艺进行了探讨。

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