If the wave packet has a narrow bandwidth, it will extend over a large region of space and time.
如果包带的带宽很窄，那么它将占据一个很大的空间和时间区域。
A longer holding time of ultrasonic wave causes a horizontal localized shear region.
超声时间的延长在金丝球内产生水平剪切层。
A longer holding time of ultrasonic wave causes a horizontal localized shear region.
超声时间的延长在金丝球内产生水平剪切层。
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