• 1. echo back from: 从…发出回声

• 1.Such surfaces reflect most of the bats' echolocation energy away from it, but some energy hits the surface perpendicularly, sending an echo back directly beneath the bat.
  这样的平面反射了大部分蝙蝠的声波，但是有一部分能量垂直撞击到表面上，声波回传至蝙蝠。
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• 2.The sound waves from these cries bounce off objects and echo back to the bat's ears.
  从这些叫声中传出的声波，被物体弹回，回声传到蝙蝠的耳里。
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• 3.The birdsong is the echo of the morning light back from the earth.
  鸟的歌声是曙光从大地反应从前的回声。
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