反射信号来自于少量杂质。
超声波碰到杂质或分界面会产生显著反射形成反射成回波，碰到活动物体能产生多普勒效应。
Ultrasonic encounter impurities or boundary surface will produce significant reflection form reflex into echo, encounter moving objects can produce doppler effect.
这种球体对入射光存在折射、衍射、反射、吸收和杂质对入射光波的衰减作用等影响。
The sphere affects the incident by the refraction, diffraction, reflection, absorption and attenuation of impurity.
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