回声反射成欢欣。

The echoes bound to a joyful sound.

youdao

这些特征应该被记录：大小、形状、回声反射性、边界、方位和衰减（例如：减弱或增强）。

These features should be noted: size, shape, echogenicity, margin features, orientation, and attenuation (eg, shadowing or enhancement).

youdao

回声定位是比较不解自明的；利用声波反射的回声来定位物体。

Echolocation is pretty self-explanatory; using echoes reflected by sound waves to locate things.

youdao