因此，研究地铁列车引起的振动及减振方法不仅必要而且十分迫切。
So, research on the vibration induced by metro vehicle is urgent and important.
如何防范这些风险的发生，是我们应该而且十分迫切研究的一个问题，下面就针对这个问题进行简要探讨。
How to prevent the occurrence of these risks is very urgent so that we explore. In the following, the issue for this study is briefly discussed.
混凝土桥梁的耐久性问题一直是一个世界性难题，开发新的材料对此进行防治，不仅必要，而且十分迫切。
The life of concrete bridge deck is a cosmopolitan problem, so it is necessary and urgent to study new material for protecting.
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