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| 塞子 | |||
| plug core: 22 phrases in 9 subjects |
| Automobiles | 5 |
| Chemistry | 1 |
| Drilling | 2 |
| Electronics | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 3 |
| Plastics | 3 |
| Technology | 3 |
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