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| 11. | Of or relating to twelfths. |
| 十二分之几的 |
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| 12. | parts per billion |
| 十亿分之几 |
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| 13. | equivalent per million |
| 百万分之当量 |
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| 14. | weight ratio of constituent |
| 成分之重量比 |
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| 15. | Obligatio dividua |
| 可分之债 |
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| 16. | billionth of a second |
| 毫微秒；十亿分之一秒 |
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| 17. | Ppt (part per trillion) |
| 1兆分之￥ |
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| 18. | seven-eighths rule |
| 八分之七定则 |
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| 19. | One fifth of a gallon or four fifths of a quart of liquor. |
| 五分之一加仑或一夸脱酒的五分之四 |
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| 20. | Micrometre: One-thousandth of a millimeter. |
| 微米:百万分之一米。 |
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