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| 1. | Nose-dive; plummet |
| 暴跌 |
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| 2. | criterion; yardstick; standard |
| 准绳 |
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| 3. | optical plummet |
| 光学锤准器 |
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| 4. | Marking line, compass and square |
| 准绳规矩 |
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| 5. | 是谁把准绳拉在其上? |
| NIV] Who marked off its dimensions? Surely you know! Who stretched a measuring line across it? |
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| 6. | inverse plummet observation |
| 倒锤线观测 |
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| 7. | optical plummet centring |
| 光学垂线对中 |
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| 8. | laser plummet apparatus |
| 激光铅垂仪 |
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| 9. | direct plummet observation |
| 正锤线观测 |
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| 10. | What caused the balloon to plummet? |
| 是什么原因致使气球骤然跌落下来了呢？ |
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