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| 转轮的轴面; 子午面【天文】 | |||
| 子午〔经圈〕面 | |||
| 子午面; 子午平面 | |||
| 经圈面 | |||
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meridian plane : 10 phrases in 4 subjects |
| Aviation | 1 |
| Desert science | 1 |
| Space | 4 |
| Technology | 4 |
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