As an imaging tool, the acoustic lens beats ultrasound imaging because the sound pulses can be focused much more tightly and can be easily repositioned.
作为一个成像工具，声透镜冲击了超声波的显像，因为声脉冲可以更加紧密地聚焦，可以很容易地重新定位。
For some time cosmologists have used sound as a diagnostic tool.
宇宙学家将声音用于诊断工具已经有些时日了。
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