白垩岩 meaning in English

chalk rock
chalkstone

These machines , which carried out essential innovations , brought in large - scale orders . machines incorporating new features were also designed for application in the pit and quarry industry : in 1950 the first roll crushers for processing of clay , gypsum and limestone as well as jaw crushers for hard rock were produced
此外，奥贝玛公司也为矿石和土壤工业部门制造了新的机械品种： 1950年，制造了第一批用于捣碎陶土白垩岩石膏和石灰石的辊破碎机以及用于捣碎硬岩的颚式破碎机。