Environmentally friendly paving block that can keep the air clean
![2_CEE_02_0812_1](/kteo/-/media/department/kteo/content/tech-showcase/tech-search/2construction/2_cee_02_0812/2_cee_02_0812_1.jpg?mh=1000&mw=478&hash=9A62742488AE1F007C7BDEB1F60AC611)
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