parent rack meaning in English
主炸弹架
Examples
- Chemical analyses showed that the former was characterized by higher sio2 , k2o and lower a12o3 , tio2 than the later , as well as the content of fe varying on a great range with the deposit - forming parent racks and weatering conditions
其结果表明，风化型高岭土的化学成分一般属硅高铝低型，钾含量偏高，钛含量低，铁含量则随成矿母岩和风化条件的不同波动范围大，矿物组成主要为结晶度较差的高岭石、水云母和石英，以及极少量的管状埃洛石。