defocused lens
... defocused beam 散焦射束 defocused lens 散焦透镜 defocused speckle photography 散焦斑点照相术 ...
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透镜可以采用多种形状，包括菲涅尔特征并且可以聚焦、准直或散焦该超声能量。
The lens may take a variety of shapes, including Fresnel features, and may focus, collimate, or defocus the ultrasonic energy.
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