Coarse, hard material, as gravel, broken stone, slag, or similar material, used to provide a base in building roads, embankments, etc., or to…
| 单词 | θ215978 |
| 释义 | society > occupation and work > materials > derived or manufactured material > clay compositions > baked clay > [noun] > used as bed of roads or railways (1) ballast1701 Coarse, hard material, as gravel, broken stone, slag, or similar material, used to provide a base in building roads, embankments, etc., or to… |
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