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| periodic; periodical | |||
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周期 式 : 78 phrases in 13 subjects |
| Business | 3 |
| Chemistry | 1 |
| Cryptography | 1 |
| Electric machinery | 4 |
| Electronics | 2 |
| Hydroelectric power stations | 1 |
| Metallurgy | 28 |
| Oil / petroleum | 1 |
| Planning | 1 |
| Space | 1 |
| Steel production | 4 |
| Technology | 30 |
| Telecommunications | 1 |
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