瓷砖及粘贴瓷砖的水泥砂浆都会存在热胀冷缩的问题，在温度或湿度改变的过程中，瓷砖及水泥砂浆都会存在一定的伸缩，如果不留缝的话，会导致瓷砖在后期使用的过程中出现起鼓或者开裂。
Ceramic tile and cement mortar pasted with ceramic tile will have the
problem of thermal expansion and cold contraction. In the process of
temperature or humidity change, ceramic tile and cement mortar will have
certain expansion and contraction. If there is no seam left, it will
lead to bulge or cracking of ceramic tile in the later use process.
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2、瓷砖存在合理误差
2. There are reasonable errors in tiles
瓷砖尽管现在都是机械化生液压钢坝 产，但是在产品生产的过程中，会存在着一定的尺寸误差（误差过大就属于产品的质量问题了），如果不留缝的话，容易出现瓷砖铺贴时的接缝不平整，影响瓷砖的美观。
Although the ceramic tile is now mechanized production, but in the
process of product production, there will be a certain size error (too
large error belongs to the quality problem of the product). If there is
no seam left, it is easy to have uneven joints when tile paving, which
will affect the beauty of ceramic tile
