cinder block

noun
🔊/ˈsɪndə blɒk/
🔊/ˈsɪndər blɑːk/
(North American English)
(British English breeze block)
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  1. a light building block, made of sand, coal ashes and cement煤渣砌块,焦渣砖(用沙、煤渣和水泥制成)