For PV constant of PR crystal depending on wavelength, we choose different signal and background beam in theory analysis and experiment.

由于光折变晶体的光伏常数依赖于波长，因而选则不同波长的背景光和信号光进行理论分析和实验研究。

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A new technique has been researched on the feasibility and regularity for removing impurities from rude selenium by vacuum distillation in theory analysis.

从理论上分析了采用真空蒸馏的方法将粗硒提纯除杂的可行性和规律性。

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However there are also a number of arguments on how to choice the environment policy to solve the more and more serious environment problem both in theory analysis and in practice.

但是，无论是在理论分析还是在政策实践过程中，关于选择什么样的环境政策才能更有效地解决日益严峻的环境问题却一直是一个争论不休的主题。

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The algorithm could be of great interest to Twitter, which could charge a premium for ads linked to popular topics, but it also represents a new approach to statistical analysis that could, in theory, apply to any quantity that varies over time: the duration of a bus ride, ticket sales for films, maybe even stock prices.

FORBES: Twitter Trending Prediction Algorithm: Possibly Of Most Use To Journalists

One starting point in any analysis of failed countries is the theory of Max Weber, the father of social science.

ECONOMIST: Failed states

This open-source data analysis software allows everyone in theory to know the exact value of their house, their car and even their business prospects.

FORBES: Help Us Crowd-Source Forbes Magazine: Names You Need to Know in 2011