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。
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。
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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