Portugal and Spain had possessed vast empires that waxed and waned.

The Roman and Mayan empires , they noted, also fell during cold periods.

他们还指出罗马和玛雅也是在天气较冷时期灭亡的.

Throughout history empires have waxed and waned.

历史上各个帝国革故鼎新均有兴衰.

Yet few of us have much affection for these dull empires.

但我们很少有人喜欢这些笨拙的帝国.

Acoustie formation factor formula is an empiric formula proposedrecently.

声波地层因素公式是最近提出的有关测井声速的经验公式.

This text will make a brief summarize of initial empiric antibiotic therapy.

本文就初始经验性抗菌药的选择作一简要概述.

Empirical results are needed in the transonic Mach regime.

在跨音速马赫数范围内需要经验结果.

This paper took an approach combining theoretical and empirical analysis.

本文采取了理论分析和实证研究相结合的方法.

Mechanistic models are considerably more robust as predictive tools than are purely empirical models.

机械模型作为预测工具,比纯粹的经验模型要完善得多.

Based on the empirical envelope of a compressed video stream, a traffic description model was developed.

以视频码流流量的实测包络为基础, 提出了一种流量描述模型.

Each problem set will contain one empirical exercise and one more exercise.

每个习题集将包括一个实际练习和一个练习题.

The standards are also not intended to de ? ne or determine the format for writing empirical work.

这些标准同样不打算规定或决定撰写经验研究工作的格式.

This empirical study, based on the literature review and analysis, mainly analyses factors influencing training effectiveness.

本文根据文献研究和实证研究结果, 主要分析影响饭店培训效果的因素,比较诸因素对培训效果影响的差异.

For ecological benefit and social benefit, it also makes theoretical analysis and empirical analysis.

对有机食品产业的生产效益和社会效益也作了理论分析和实证分析.

A thorough process description and empirical analysis of SPC was the major theme of this work.

一个针对SPC的大致的过程描述和经验分析也是这一工作的主题.

This paper proves the hypothesis by theoretical and empirical method.

本文通过理论分析和实证分析方法对该假说进行证明.

We now have empirical evidence that the moon is covered with dust.

现在我们有实践经验证明月球上布满了灰尘.

To approach above two issues from theoretical and empirical perspective is important.

对此问题给予理论解释和实证分析无疑具有重要意义.

Based on that, we carried on empirical study by data simulation means to test our model.

在此基础上, 本文还采用数据模拟的方法对提出的优化模型进行了数值分析.

The empirical results show there exists stronger positive relationship between insider shareholders and corporate performance.

而法人股、流通股与公司绩效的正相关关系在高度动态的环境下更趋于显著.

But none of them have ever backed this up with sound empirical evidence.

但是,没有任何一位占星学家以实实在在的试验性证据来支持自己的论点.