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ring-and-ball
| apparatus
| ring and ball | |
| mech. | 圈与球 |
| apparatus | |
| gen. | 器械，装置 |
| el. | 仪器，装置 |
| el.mach. | 电器 |
| hydroel.st. | 仪表; 器械 |
| met. | 机构; 机器 |
| |||
| 密封圈与球 | |||
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ring-and-ball apparatus : 32 phrases in 9 subjects |
| Architecture | 2 |
| Chemistry | 2 |
| Electronics | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 3 |
| Plastics | 4 |
| Polymers | 3 |
| Technology | 14 |
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