名词
中文翻译：二次回响回声
同义词：
['secondary echo', 'secondary echo wave例句：1. The second-trace echo is a crucial component of the signal processing system.（二次回响回声是信号处理系统的关键组成部分。）']
例句：
-
1. The second-trace echo is a crucial component of the signal processing system.
二次回响回声是信号处理系统的关键组成部分。
-
2. The scientist used a special device to measure the second-trace echo.
科学家使用一种特殊的设备来测量二次回响回声。
-
3.The second-trace echo was so faint that it was difficult to detect.
二次回响回声非常微弱，难以探测到。