second trip echo
二次扫描回波 second trace echo
第二次返射回波 second time around echo
二次谐波回旋行波管 Second harmonic Gyro-TWT
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根据2003年几次强对流天气的观测资料，对其中三体散射长钉、二次回波旁瓣回波等虚假回波进行了分析。
The analysis of the virtual echo such as three -body scatter spike echo, the secondary echo, the side -lobe echo is given echo based on observational re cords of severe convectional weather in 2003.
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