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| 二次谐波 | |||
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| 第二谐波; 二次谐波 | |||
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| 第二谐波; ★ 二次谐波 | |||
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second harmonics : 39 phrases in 13 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Chemistry | 3 |
| Earth sciences | 1 |
| Electric machinery | 1 |
| Electronics | 17 |
| General | 1 |
| Geophysics | 1 |
| Hydroelectric power stations | 2 |
| Information technology | 1 |
| Materials science | 1 |
| Polymers | 2 |
| Technology | 7 |