| 1. | Such wave fronts are separated from one another by one-half wavelength .
这种波阵面彼此间隔半个波长。
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| 2. | At each interface the spreading wave front is made discontinuous .
在每一分界面上扩展的波前出现间断。
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| 3. | Successive wave fronts in this case form a series of concentric spheres .
相继波前形成了一系列的同心球面。
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| 4. | It starts with zero and grows to a maximum slightly behind the wave front .
它从零值开始，并在稍后于波阵面处增长到最大值。
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| 5. | Successive positions of the wave front are then given by the envelopes of the secondary waves .
因此波前的相继位置即为次波的包络面。
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| 6. | The planes of the wave front and the reflecting surface are also normal to the plane of the figure .
波阵面的诸平面与反射面都与图面垂直。
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| 7. | If a refraction or a reflecting body is irregular, the wave front undergoes a deformation .
如果折射体或反射体是不规则的，波前即产生变形。
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| 8. | A train of light wave may often be represented more simply by means of rays than by wave fronts .
一列光波往往可以更简单地用光线，而不用波阵面表示。
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| 9. | The radii are proportional to the time which has elapsed since the wave front occupied the position wi .
半径与波前占据wi位置以来能经过的时间成正比。
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| 10. | When the incident wave front reaches this point, the reflected wave is still some distance away .
当入射冲击波波阵面到达这一点，反射波离开它还有一段距离。
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