| 1. | This phenomenon is called velocity dispersion .
这种现象称为速度频散。 |
| 2. | The nitrate ion has four fundamental modes of vibration .
硝酸离子有四个基频形式。 |
| 3. | Rains are frequent here in spring .
这儿春季雨很频。 |
| 4. | It covers about an octave .
它大约占一个倍频程。 |
| 5. | There is an infinite number of harmonic-frequency components .
这里存在着数目无穷的谐频分量。 |
| 6. | The doppler frequency can be obtained as a heterodyne or beat effect .
由于外差或频差效应，能够得到多普勒频率。 |
| 7. | Frequent skimming or improper skimming can cause a much higher dross loss .
撇渣过频或操作不当会使浮渣损失很大。 |
| 8. | Harmonics can be added to a wave which has a single frequency to produce a complex wave .
谐音加在单频波上产生复波。 |
| 9. | Palpitation from frequent extrasystoles or other arrhythmia is common .
来自频发的期前搏动或其他心律不齐的心悸亦属常见。 |
| 10. | The earth's rotation and its motion around the sun add an appreciable frequency shift .
地球自转与地球绕日公转产生附加的频移。 |
