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过去在越南，有花纹的格子体块常常被用来获取自然通风的遮蔽设备。这类体块用60厘米见宽和40厘米见高的预制混凝土块堆砌而成。
Pattern blocks, which used to be a popular shading device in Vietnam to get natural ventilation, are made of pre-cast concrete with 60cm width and 40cm height.
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