 |
prerefining
| period
| prerefining | |
| met. | 预精炼 |
| oil | 预精制 |
| period | |
| gen. | 时光 |
| hydroel.st. | 时期 |
| math. | 周期，时期 |
| met. | 阶段; 时间 |
| sport. | 期 |
| |||
| 预精炼 | |||
| 预精制 | |||
| 预先精炼; 初步提纯 | |||
| prerefining: 4 phrases in 1 subject |
| Metallurgy | 4 |
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