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| 21. | A chance occurrence or event. |
| 偶然事件，偶然的机会 |
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| 22. | datum for reduction of sounding |
| 测深折算基点 |
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| 23. | collateral point |
| 第二方位基点 |
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| 24. | The analysis of a problem is the starting point for itssolution. |
| 分析问题是解决问题的基点。 |
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| 25. | cutting edge principal point |
| 切削刃基点 |
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| 26. | Happening by chance or accident;fortuitous. |
| 偶然的偶然或意外发生的；偶然的 |
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| 27. | starting datum mark |
| 起测基点 |
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| 28. | by some accidental circumstance |
| 偶然 |
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| 29. | eight principal points |
| 八个主点(四个基点 |
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| 30. | (phr v)chance on sb/sthhappen to meet sb or find sth |
| 偶然遇见某人;偶然发现某事物. |
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