substratum
US /səbˈstræt̬.əm/
UK /səbˈstræt̬.əm/
名詞
1.
基質
a layer of rock, soil, or similar material that is below another layer:
例:
•
A substratum of clay kept moisture close to the topsoil.
Lingolandでこの単語を学ぶ
基質
a layer of rock, soil, or similar material that is below another layer: