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| 水平仪气泡 | |||
| 水准器; 水准气泡 | |||
| 水准仪; 水准气泡 | |||
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level bubble : 24 phrases in 10 subjects |
| Agriculture | 2 |
| Archery | 1 |
| Aviation | 2 |
| Compressors | 1 |
| Drilling | 1 |
| Hydroelectric power stations | 2 |
| Metallurgy | 1 |
| Oil / petroleum | 2 |
| Space | 1 |
| Technology | 11 |
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