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| 休止角 (沙丘滑落面的临界角多为30°〜35°) | |||
| 临界角; 全反射角 | |||
| 极限角 | |||
| critical angle: 28 phrases in 10 subjects |
| Air defense | 2 |
| Automobiles | 2 |
| Electronics | 1 |
| Engineering geology | 3 |
| Explosives and Explosive Ordnance Disposal | 3 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Space | 5 |
| Technology | 8 |
| Wind Energy | 2 |
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