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| 开-闭的井关 | |||
| 开闭; 开启-闭合 | |||
| 开一关的 | |||
| open -closed: 31 phrases in 13 subjects |
| Animal husbandry | 1 |
| Automobiles | 5 |
| Earth sciences | 5 |
| Electricity | 3 |
| Electronics | 1 |
| General | 2 |
| Genetics | 1 |
| Geophysics | 2 |
| International trade | 1 |
| Logistics | 1 |
| Plastics | 4 |
| Polo | 1 |
| Technology | 4 |
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