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Evacuated Tube
| Transportation
| evacuated tube | |
| tech. | 真空管; 电子管 |
| transportation | |
| environ. | 交通运输 |
| hydroel.st. | 运输工具; 输送 |
| interntl.trade. | 运输业; 运输费; 货运; 搬运 |
| tech. | 运输 |
| |||
| 真空管; 电子管 | |||
| Evacuated Tube: 3 phrases in 2 subjects |
| Logistics | 1 |
| Solar power | 2 |