vertical track irregularity
...轨道高低不平顺；N维超立方体点集；功率谱[gap=1753]Key words: train-bridge system model; probability density evolution method; vertical track irregularity; N-dimensional hypercube point set; power spectrum..
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vertical track irregularity
垂直航迹不规则
以上为机器翻译结果，长、整句建议使用 人工翻译 。