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| second harmonic | |
| oil | 第二谐波 |
| oil од. | 二次谐波 |
| second harmonics | |
| railw. | 二次谐波 |
| alternating | |
| busin. | 交流; 轮流; 变更; 修改 |
| earth.sc. | 成互层 |
| math. | 交变的 |
| sport. | 交替的; 交互的 |
| swim. | 交替 |
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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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| 二次谐波 | |||
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second harmonic alternating : 2 phrases in 1 subject |
| Chemistry | 2 |