And ultra high frequency time series is tick-by-tick data, which contain plenty of market information.

而超高频时间序列是市场上每笔交易的实时数据，其中包含了丰富的市场信息。

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High frequency time series is referred to financial data which is sampled with interval of one hour, one minute even one second.

高频时间序列通常是指以每小时、每分钟甚至每秒为频率所采集的金融类数据；

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Empirical evidences show that the distributions of high frequency time series are "fat tail" type distribution rather than normal distribution with "light tail" as those in traditional modeling.

经验表明高频时间序列的分布常是“肥尾”型的，而非传统建模中的“薄尾”型的正态分布。

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For decades, controllers relied on position reports over high-frequency radio every hour or so, competing for air time with fishing vessels and all kinds of other traffic.

WSJ: How New Air-Traffic Control Systems Operate Over Oceans

"While a 150, 000-170, 000 per month trend in payrolls is far from booming, it is strong enough over time to keep the unemployment rate moving down, " said Jim O'Sullivan at High Frequency Economics.

BBC: US unemployment rate holds steady in December at 7.8%

"Usually, bat sounds are inaudible to humans as they are too high for us to hear but special 'time expansion' ultrasonic detectors convert these sounds to a lower frequency, " Prof Jones, who is also chairwoman of the UK Bat Conservation Trust, explained.

BBC: Website calls on people to become 'bat detectives'