It is shown that the barium exists in the forms of BaAl 2O 4 and BaCO 3 phases. The BaAl 2O 4 crystallites should be the centers for NO x storage.是什么意思_It is shown that the barium exists in the forms of BaAl 2O 4 and BaCO 3 phases. The BaAl 2O 4 crystallites should be the centers for NO x storage.在线翻译_英语_读音_用法_例句