1)hour glass structure,砂钟构造2)sandglass structure,沙钟构造3)sandball construction,砂球构造4)structure infered by the heavy minerals,构造重砂5)sand-veins,砂脉构造6)sand watch,沙漏(沙钟)构造
用法例句
In this formation abundant centimeter-scaled pygmatic sand-veins are well developed.