求翻译：随着我国高速铁路、客运专线的蓬勃发展，无砟轨道已广泛被应用在这些铁路上。无砟轨道在满足高速列车安全性、平稳性，舒适性方面发挥了非常重要的作用。同时在高速铁路线上出现了许多新型、大跨桥梁结构，研究高速列车通过大跨度桥梁时的安全性显得尤其重要，我国学者对设计时速250km以下高速列车过桥时的桥梁动力性能进行了相应的试验研究，并取得了很多成果，而对设计时速350km高速列车过桥时的桥梁动力性能研究的较少，本文以设计时速350km的武广客运专线上的汀泗河特大桥为对象，对CRH2动车组不同时速下通过该桥140m下承式钢箱系杆拱桥动力性能进行了研究。是什么意思？

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Along with our country high-speed railroad, the passenger transportation special line vigorous development, the non-fragments track has been applied widely on these railroads.The non-fragments track is satisfying the high speed train security, the stability, the comfortable aspect has played the ext

As China's prosperous development of high-speed rail, passenger, no track has been widely used in the railways. Ballastless track in meeting the high speed train security, stability, comfort has played a very important role. While in high speed rail line Shang appears has many new, and large across