Income inequality can in principle be affected more swiftly than mobility through changes in taxes and spending.
收入的不平等问题原则上比社会流动性问题更容易改善，前者可以通过税收和支出的变化加以调节。
2
The technical background and principle of Ion Mobility Spectrometry technique is introduced in the paper.
介绍动态离子分析技术的技术背景和原理。
3
This article introduced a gas testing system, briefly elaborating work principle of the ion mobility spectrometry, hardware component and software design.