1911年，蔡司产品实现了柯勒提出的在一台显微镜上所有物镜齐焦的想法。也就是，当从一个物镜转换另一个物镜后，图像依旧在焦面上。
In 1911, Zeiss implements Köhler's idea of parfocalizing all objectives used on a microscope, which means that the image remains in focus when the observer exchanges one objective for another.
本文提出了一类齐次三维波动方程柯西问题求解的新方法，该方法比一般的求解方法更简便。
In this paper, we present a new method to solve the Cauchy's problem of the homogeneous wave equations of three dimensions, which appear comparatively simple and feasible.
这些结果是利用如下的两种方法获得的：其一是历史上地震数据的定性资料分析，其二是利用非齐次马尔柯夫模型的定量计算。
The prediction is made using the following 2 methods: the deterministic statistical analysis of the historical seismic data and the computation by means of the inhomogeneous Markov model.
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