understratum /.ʌndә'streitәm/ 📖 中文释义 n. 底层 🔗 释义中的汉语词 底层 📘 English Definition(英文释义) n. The layer, or stratum, of earth on which the mold, orsoil, rests; subsoil. ← understrata U 字母词表 understratums →