以下为句子列表：
英文: The foundation mortar layer for bearing support is used as supporting foundation when laying the piping system and the mixing ratio of cement and sand should be about 1:3.Be sure to level it well and give perfect curing.
中文: 起支持作用的基础灰浆层在铺高热炕供暖管时起支撑作用，灰浆的混和比为水泥：砂＝1：3，施工时要可能保持水平，需要彻底养护。
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