That night, the researchers measured one particular sleep phenomenon: the brief bursts of high-frequency waves known as “sleep spindles.”

那天晚上，研究人员研究了一种特殊的睡眠现象：出现的短暂高频率脑电波，即众所周知的“睡眠纺锤波”。

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You can't hear waves of such a high frequency.

你听不到这么高频率的声波。

《柯林斯英汉双解大词典》

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That, they say, gives them access to more telling, high-frequency waves that say a lot more about cognitive intentions.

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High-frequency waves have short wavelengths.

ECONOMIST: Archaeology

Recent discoveries, however, have such medgadgets being powered by photons, hip hop and now high-frequency radio waves.

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