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| Crassula volkensii | |||
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雨 心 : 21 phrases in 9 subjects |
| Aviation | 4 |
| Bridge construction | 1 |
| Desert science | 1 |
| Electronics | 1 |
| Engineering geology | 1 |
| General | 1 |
| Hydroelectric power stations | 1 |
| Technology | 7 |
| United States | 4 |
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