- echo
 - ['ekəu]
 - vt. 反射;重复
vi. 随声附和;发出回声
n. 回音;效仿 
参考例子
           - 1.The big ball echoes the faintest sounds.
 - 最微小的声音在这大厅里也会产生回响。
 
- 2.Many network protocols support an echo protocol.
 - 许多网路协定支援回应协定。
 
- 3.The reflected sound causes reverberation or echo.
 - 反射的声浪,会造成混响或回音。
 
英文解释
           - n.
 - 1.the persistence of a sound after its source has stopped
 - 2.(Greek mythology) a nymph who was spurned by Narcissus and pined away until only her voice remained
 - 3.a reply that repeats what has just been said
 
- v.
 - 1.to say again or imitate
 - 2.ring or echo with sound
 - 3.call to mind
 
网络释义
               - echo
 - 回声; 回音; 共识; 回声,反射;
 
- Echo melody
 - 旋律的回响 试听; 旋律的回响; 旋律的迴响; 旋律购乐学的回响;
 
- echo sounder
 - 回声测深仪; 回声探测仪回声测深仪; 回音测深器; 回声测深器;
 
- PAN Echo
 - 回波; (回波) 飇 A签坫?;
 
- echo suppressor
 - 回波抑制器; 反射波抑制器; 回声抑制器; 回音抑制器;