prepared gravel的意思|示意
美 / prɪˈpeəd ˈɡrævəl /
英 / prɪˈpɛrd ˈɡrævəl /
备制的砾石
prepared gravel相关例句
The cushion layer for the dam is constructed with the material prepared mainly with natural sandy gravel and mixed with proper amount of pebble and coarse sand.
大坝垫层料采用以天然砂砾料为主、掺入小石和粗砂以调整级配的方式生产。