以下为句子列表：
英文: Based on the longtime hydrological observation records during the years from 1956 to 1995, properties of precipitation of Weihe basin in Shaanxi province of different time scale (including month, year and decade scale) is analyzed by the method of contras
中文: 摘要根据1956-1995年的实测水文资料（降水和河川径流量资料），采用特征值对比方法，对陕西省境内渭河流域不同时间尺度内降水特征进行分析，并对流域内多年径流变化也做了相应的统计分析，从而揭示河川径流对降水变化的响应关系，并确定出河川径流变化的主要原因。
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英文: But now this time scale has shrunk to about 50 years, or less.
中文: 但是如今它已经缩短至50年甚至更短。
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英文: Era A unit of the geological time scale that is made up of several periods, e.g. the Mesozoic Era comprises the Triassic, Jurassic, and Cretaceous periods.
中文: 代：量度地质时期的分类单位，代由若干时期组成，如中生代包括三叠纪、侏罗纪和白垩纪。
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英文: The time series nonstationarity has relation to system and time scale with which researchers are concerned, and the research of nonstationarity focuses on the fields of the statistics, nonlinear science and time-frequency analysis now.
中文: 摘要时间序列非平稳度不仅是系统特性的反映，还与研究者感兴趣的时间尺度有关，目前相关的研究集中在统计学，非线性科学和时频分析领域。
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