One difficulty with direct methods is that the designer spends a great deal of time focusing on the velocity distribution; the geometry is secondary.
一个直接的方法就是难度设计者花费大量的时间专注于速度分布；几何为辅。
Objective: Study the influence of parameters such as attenuation coefficient, velocity of sound, and temperature of medium on focusing sound field.
前言：目的：研究声衰减系数、声速、温度等媒质参数对声聚焦的影响。
Such as how to select focus functions and focus Windows, how to perform feedback control, and how to improve the auto-focusing velocity etc., are far from completely solved.
在如何选择对焦评价函数和对焦区域、如何进行反馈控制和如何提高对焦速度等方面，还有诸多问题有待解决。
The results showed that the effect of group velocity dispersion(GVD) on the pulse with large chip was slight and the effect of spectral width on the self-focusing properties could be ignored.
研究结果表明，群速度色散（GVD）对大啁啾脉冲的影响很小，谱宽对自聚集的影响可以忽略。
The velocity and precision are two important aspects of the auto-focus system. They can decide whether the system can quickly locate the focusing point to obtain clear image.
对焦速度与精度是自动对焦系统中最重要的两个参数，它们决定系统能否迅速地定位到焦点处，以获取清晰的图像。
The velocity and precision are two important aspects of the auto-focus system. They can decide whether the system can quickly locate the focusing point to obtain clear image.
对焦速度与精度是自动对焦系统中最重要的两个参数，它们决定系统能否迅速地定位到焦点处，以获取清晰的图像。
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