heavy gradient meaning in Chinese

大梯度
陡度
陡坡
陡梯度

In our country , many railway lines which were built in mountainous area have heavy gradient and curves with small radius
由于历史的原因，我国大部分既有线路，特别是中、西部的既有线路等级不高，基础条件差。
In our country , many railway lines which were built in mountainous area have heavy gradient and curves with small radius . so it is difficult to improve them and a great amount of cost is needed in the modification of them
由于我国幅员辽阔，有相当多的铁路处于山区，线路坡度大、曲线半径小、建设标准低，如果按照三大干线标准改造线路使之适应提速要求，铁路的改建很困难，所需人力物力不亚于修建新铁路，不适合我国目前的国情。