回声

• - what the hell is that ? - echolocation
  -到底是什么东西？ -是回声定位法
• Echolocation and acoustic communication in bats
  回声定位蝙蝠及其声通讯
• Adaptive echo cancellation and noise reduction algorithm
  一种自适应回声抵消和噪声消除算法
• His voice echoed in the big empty hall
  他的声音在空荡的大厅里发出回声
• This wall is famous for producing echoes
  这墙壁因能发出回声而出名。
• If you shout loudly , you ' ll hear the echo
  如果大声喊,就能听到回声
• The echo mocks her origin to prove she is the original
  回声嘲笑她的原声，以证明她是原声。
• General specifications for echo sounder
  垂直回声探鱼仪通用技术条件
• Your ? voice ? should ? be ? resonant ? and ? sustained ? when ? you ? speak ;
  声音要有回声并能稍持续一阵儿；