相關(guān)單詞近義詞 layer 層, vein 靜脈, bed 床, level 數(shù)量, band 樂隊(duì), division 劃分, branch 分部, section 部分, echelon 職權(quán)的等級, social class 社會地位, class 等級臨近詞stratus, stratify, stratum use, stratum age, stratum gap, stratum trap, stratum bias, stratum load, stratum level, Stratum model, stratum layer, stratum board 返回 stratums