【橙梦干货】荷兰留学,那些跟钱有关的问题:学费原来可退税

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a powdery substance made with calcined lime and clay. It is mixed with water to form mortar or mixed with sand, gravel, and water to make concrete.
[color=rgba(0, 0, 0, 0.54)]We were having some building work done and there was cement , sand and mortar lying around.

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