The best human sopranos sing impressively high notes, but they cannot match the clear-winged woolly bat, which a new study has just determined produces the world's highest pitched call.

最好的女高音歌唱家的高音给人以震憾，但是他们仍然不能达到洁翼彩蝠的声音高度，一项新的研究表明它能发出世界上最高的音调。

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Unlike other bats and trilling birds, the clear-winged woolly bat and its relatives did not switch to a more narrow-band call as they got to this super-fast calling level.

不像其他蝙蝠和啭鸣的鸟类，洁翼彩蝠和它们的近亲因为达到了超高速水平并不需要切换到一个更窄的波段来啼叫。

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The bat-winged B-2, for instance, saw its production goal slashed from 132 planes to a mere 21 when the Cold War ended, amidst widespread complaints about its billion-dollar price-tag.

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