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- change of wave packet shape 波包形状变化
- By analyzing intuitional images presented in this work, the dynamical process of wave packet is investigated. 通过分析文中的直观图像，研究了波包的动力学过程。
- Then the graph of the changes of group and energy velocity with the length of cutoff region and the main frequency of the wave packet is received. 计算了波包穿越势垒的群速和能量速度,得到群速和能速与截止区长度的关系图,以及群速与激励源的工作频率的关系图。
- When the length of cutoff region is so long or the main frequency is so high to approach the cutoff frequency, the main frequency of wave packet is so high to exceed the cutoff frequency. 电场频谱图显示波包的频谱明显上移,而且当截止区长度足够大时,或者输入波频率趋近于截止区截止频率时,波包的峰值频率甚至超过了截止区的截止频率。
- As the tradition method can only estimate the addition of wave drag from subsonic to supersonic, and can not calculate the change of drag when Mach number increases. 由于传统的工程计算方法只能估算旋成体从亚音速到低超音速的波阻增加量，不能计算阻力随马赫数增加而引起的变化。
- Take a change of clothes with you. 把你替换的衣服带去吧。
- A change of diet may do you good. 改变一下饮食对你可能有好处。
- When (The equation is abbreviated), especially before and after (The equation is abbreviated), its characteristic appears more remarkable, which can be used to study the inner mechanism of the change of wave length. (方程式略)时，特别是(方程式略)前后，其特征会更加显著，由此可探讨波长变化的内在机理。
- The number of wave crests and wave troughs of the flame varies regularly with the change of frequences of incoming waves. 火苗的波峰和波谷数目随入射声波的频率改变而有规律的变化。
- A good pitcher has a change of pace. 一个好投手能投出速度捉摸不定的球。
- The doctor urged a change of air. 医生力劝换个环境。
- Circumstances have compelled a change of plan. 因情况所迫，计划已经改变。
- Please notify us of any change of address. 地址如有变动，请通知我们。
- Light and sound move in the form of wave. 光线和声音以波的形式传播。
- I noticed a swift change of expression in his face. 我注意到他脸上的表情很快地变化。
- The sea wall sustained the shock of waves. 海堤经得起海浪的冲击。
- She knew with a change of scene she would soon buck up. 她知道环境一改变她将快乐起来。
- A short, irregular motion of waves. 碎浪波浪短而不规则地运动
- Relationship of Wave Crest Coeffcien. 波峰系数与电流波形的关系。
- If we are to avoid defeat we need a change of leadership. 我们要避免失败的话，就要换掉领导人。
