在大多数介绍狭义相对论的文章中，导出洛仑兹变换公式的依据都是相对性原理和光速不变原理。
In this paper, authors present a derivation of the Lorents transformation by invoking the principle of relativity alone, without the principle of invariance of light speed.
同时性的相对性是相对论时空观的核心，也是使人最感迷惑之处。
Relativization of simultaneity, the most puzzling to the human being, is a core of space-time view of relativity.
还阐明了高z元素的相对性效应，高z元素的能级结构计算需采用相对论性理论方法。
Relativistic effect of high Z atoms is also discussed. A relativistic calculation is necessary to calculate the energy levels for high Z atoms.
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