 |
| |||
| element cycling | |||
| 元素循环: 14 phrases in 7 subjects |
| Agriculture | 1 |
| Desert science | 3 |
| Ecology | 1 |
| Space | 2 |
| Technology | 3 |
| Telecommunications | 1 |
| Water resources | 3 |
|
| |||
| element cycling | |||
| 元素循环: 14 phrases in 7 subjects |
| Agriculture | 1 |
| Desert science | 3 |
| Ecology | 1 |
| Space | 2 |
| Technology | 3 |
| Telecommunications | 1 |
| Water resources | 3 |