qiào / xiāo硝saltpeter, niter; to tan词频 2.6含义saltpeter; niterto tan (leather)a type of stone resembling saltpeter相关词语硝酸硝烟硝酸盐硝基硝石硝酸铵硝化甘油硝酸甘油硝酸银硝化棉亚硝酸盐芒硝