... apical tier 顶端层 knot tier 排结器 hypobasal tier 基下层 ...
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短语
地基下层泥土
subsoil
下基层
The grassroots
;
lower subbase
;
lower subbase west bank
下层基础
subfoundation
子实层基的下层
[植]
subhymenial layer
地下滤水基层
filter subbase
路基下卧层
ground subgrade
基质膜之下为基层
basement layer
下基层锻炼
temper oneself in a grassroots unit