 |
| Chinese | English |
| 国际百万分之一地图 | international one-in-a-million map |
| 百万分之一 | part per million (ppm) |
| 百万分之一当量 | equivalent per million (epm) |
|
| Chinese | English |
| 国际百万分之一地图 | international one-in-a-million map |
| 百万分之一 | part per million (ppm) |
| 百万分之一当量 | equivalent per million (epm) |