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| 21. | observation platform |
| 观测架;观测平台;观察台 |
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| 22. | concentration span |
| 注意力持久度 |
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| 23. | cantilever span |
| 挑出跨|悬臂跨 |
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| 24. | valley-span antenna |
| 山谷天线 |
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| 25. | continuous span |
| 连续桥跨结构 |
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| 26. | altitude by observation |
| 观测高度观测)真高度 |
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| 27. | unsupported span |
| 管道无支撑跨距 |
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| 28. | observation data |
| 观测数据;观测资料;观察数据 |
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| 29. | horizontal span |
| 水平跨距 |
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| 30. | infinite span wing |
| 无限翼展机翼 |
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