• 1. back wall echo: 背面回波 | 底面反射波
• 2. back-wall echo: 由被检件底面反射回来的波
• 3. rückwandechofolge back wall echo train: 后壁回波序列

• 1.At Echo Wall, visitors now offer cries instead of sacrifices, hoping to hear their voices bounce back to them.
  在回音壁前，游客们不再献祭，而是大声喊叫，希望能听见自己的回声。
  dict.yoduao.com
• 2.Everyone knows that if he shouts in the vicinity of a wall or a mountainside, an echo will come back.
  大家都知道，假如一个人在墙壁附近或是山腰里大声呼喊，就会产生一个回音。
  dict.yoduao.com
• 3.Everyone knows that if he shouts in the vicinity of a wall or a mountainside, an echo will come back.
  大家都知道，在墙壁或山腰附近发出的喊声，就会听到回声。
  dict.yoduao.com

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