- hypobasal tier
- 基: base; foundation
- 下层: lower levels
- 地基下层泥土: subsoil
- 底土；地基下层泥土；下层土: subsoil
- 下层: 1.(指机构 、 组织) lower levels 深入下层 go to lower-level units; go down to the grassroots level2.(指阶层) lower strata; sublayer 下层社会的人们 people of a lower social grade; 迎合中产阶级的最下层 cater for the humblest strata of the middle class; 流浪汉来自社会最下层。 tramps are from the lowest stratum of society.3.[生物学] substratum; substory; 下层结构 understructure; 下层社会 lower classes; 下层土 sole
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