| 1. | These fluctuations are random in nature .
这种波动的性质是任意随机的。 |
| 2. | Fluctuations are spatial and temporal in character .
这种波动的特点是空间性和瞬时性的。 |
| 3. | In their echoes, there was a tone of unutterable sorrow .
他们波动的回声中带有一种难言的悲哀。 |
| 4. | In many applications a fluctuating dc current is undesirable .
在许多应用场合，波动的直流电是讨厌的。 |
| 5. | Any company that makes only small cars is at the mercy of fluctuating gas prices .
任何只是制造小型汽车的公司都受制于石油价格波动的影响。 |
| 6. | The nature of the wave motion in sound can be made clear by considering the tuning fork .
对于音叉的考查可以使我们清楚地理解声波波动的本质。 |
| 7. | The simplest form of wave motion consists of the combination of a transverse simple harmonic vibration and a uniform translation .
波动的最简单形式是横向简谐振动和匀速直线运动的组合。 |
| 8. | This average of the actual and the deflated exchanges rates is intended to smooth the impact of fluctuations in prices and exchange rates .
这一实际和减缩的汇率平均数，旨在消除价格和波动的影响。 |
| 9. | These two measures of cyclical variation, percent of trend and relative cyclical residual, are percentages of the trend .
度量周期波动的两个量--趋势百分数和相关周期余数，都以趋势值的百分比表示。 |
| 10. | The group velocity(u) corresponds to the net result from the addition of all elements with different periods and different velocities within the wave motion .
而群速度（U）符合于波动的不同周期，不同速度的各种因素叠加的净结果。 |
