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乙层 : 111 phrases in 14 subjects |
| Architecture | 6 |
| Automobiles | 9 |
| Bridge construction | 1 |
| Chemistry | 2 |
| Electronics | 1 |
| General | 1 |
| Metallurgy | 12 |
| Oil / petroleum | 4 |
| Plastics | 4 |
| Polymers | 1 |
| Space | 4 |
| Technology | 59 |
| Textile industry | 5 |
| Water resources | 2 |
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