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| 工作原理 | |||
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principle of work : 26 phrases in 12 subjects |
| Bridge construction | 4 |
| Business | 1 |
| Chemistry | 1 |
| China | 3 |
| Commerce | 1 |
| Economics | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Hydroelectric power stations | 2 |
| Law | 1 |
| Management | 1 |
| Physics | 1 |
| Technology | 8 |