Bats are the only mammal capable of flying and are so highly evolved to be capable of pinpointing a single insect flying in the pitch black and plucking it out of the air using echo location.

蝙蝠是唯一会飞的哺乳动物，进化程度很高，能够在一片漆黑中精确定位一只飞虫的位置，并利用回波定位准确地从空中捕捉。

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Still like during the break to face the black white keys, occasionally row a sound of water, let the light echo gently and enjoy the moment ears lingering uproar of ning and after.

仍喜欢在休息的时分面对那黑的白的琴键，偶然划出一道流水的声响，就让那淡淡的回音悄悄萦回耳际，享用那一刻喧嚣当时的宁和。

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Since x-rays travel at the speed of light, the echo indicates that an object fell into the black hole around 350 years ago.

因为X射线以光速运行，因此反射表明，大约在350光年前，有一个物质落入黑洞。

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Black churchgoers, of course, often do the same thing at Sunday-morning services, and I suspect that the amenlike responses of black theatergoers are a not-so-distant echo of that old-time religion.

WSJ: Theatergoers: Can I Get an Amen? | Sightings by Terry Teachout