technology of manufacturing anion generator

• 英?[tek?n?l?d?i ?v ?m?nj??f?kt??r?? ??nai?n ?d?en?reit?]
• 美?[t?k?nɑl?d?i ?v ?m?nj??f?kt??r?? ??n?a??n ?d??n??ret?]