当不使用造影剂时，谐波是由非线性传播产生的。
When no contrast is employed, harmonics are generated by tissue itself as a result of nonlinear propagation.
本文研究理想流体中薄质球壳受激振动辐射声波的非线性传播。
This paper deals with the non-linear propagation of sound waves radiated by a thin spherical shell vibrating in ideal fluid.
本文也简述了测量超声非线性畸变的实验方法，指出了超声非线性传播中某些有兴趣的问题。
The paper concludes in its last part by mentioning the experimental methods in the study of propagation of nonlinear ultrasonic waves in solids and some problems of current interest.
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