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substrata [seb'strɔ:tə] n
archit. 下层; 底层
substratum [sʌb'strɑ:təm] n
gen. 下层地层; 根基; 促使感光乳剂固着于片基的胶层; 基〔衬〕底; 基质〔物〕
substrata: 6 phrases in 5 subjects
Architecture1
Bridge construction1
General1
Mathematics1
Statistics2