Many believe that last year’s extreme market volatility was heightened by high-frequency traders.

很多人认为高频交易者助长了去年市场的急速波动。

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Extended frequency response, high SNR, long range microphone, capable of operation at extreme temperatures, intended for the most demanding applications.

扩展频率响应、高信噪比远程麦克风，能够在极端温度下工作，用于最严格的应用。

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Optical high harmonic generation is extending frequency comb techniques into the extreme ultraviolet, opening a new spectral territory to precision laser spectroscopy.

光纤产生高次谐波频率梳技术扩展到极端的紫外线，打开一个新的精密激光光谱的光谱领土。

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Many believe that last year's extreme market volatility was heightened by high-frequency traders.

ECONOMIST: High-frequency trading

Quartz watches use very high-frequency oscillations of a crystal, which can be tuned with extreme precision to produce regular signals.

ECONOMIST: A luxury watchmaker is putting silicon in its timepieces

Record high temperatures are occurring with far greater frequency than in decades past, and crop yields decline sharply in extreme heat.

CNN: Extreme heat and droughts -- a recipe for world food woes