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| 21. | PPM (Parts Per Million) |
| 百万分之几|百万分率 |
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| 22. | One billionth(10-9) of a gram. |
| 毫微克十亿分之一克（10－9） |
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| 23. | picosecond [one trillionth of a second] |
| 微微秒| 兆分之一秒 |
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| 24. | One NM is one-1 billionth meter. |
| 一纳米是十亿分之一米。 |
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| 25. | Ns [Nanosecond] |
| 毫微秒[十亿分之一秒 |
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| 26. | One billionth(10-9) of a second. |
| 毫微秒十亿分之一秒（10－9） |
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| 27. | One billionth(10 - 9)of a meter. |
| 毫微米十亿分之一米（10－9） |
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| 28. | Three quarters of the record consists of music. |
| 唱片的四分之三是音乐。 |
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| 29. | the revelation of his identity |
| 他的身分之暴露 |
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| 30. | Some seismometers are capable of detecting ground motion as small as 1 billionth of a meter, or about 40 billionth of an inch. |
| 一些地震检波器能探测相当于十亿分之一米或亿分之四英寸的地面运动。 |
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