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| third track | |||
| third line | |||
| third wire | |||
| third wire (C 线，S 线，塞套控制线); tip-ring-sleeve (C 线，S 线，塞套控制线) | |||
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第三 线 : 20 phrases in 12 subjects |
| Animal husbandry | 1 |
| Computer networks | 1 |
| Construction | 1 |
| Earth sciences | 1 |
| Electric machinery | 2 |
| Electronics | 3 |
| Fencing | 1 |
| General | 1 |
| Information technology | 2 |
| Project management | 1 |
| Technology | 5 |
| Telecommunications | 1 |
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