ppb的翻译，读音

释义：

单词ppb书写

[化] 十亿分率

其他网友在看：

rigidly 8th Bibury ciclonicate dichromasy ethidine eversman fitoncidin frigidaria hypomelancholia klipdas langlie perfluoroalkyl phialiform polytechniciens quitclaiming rezoned scooby ten-membered terpane