Firstly, the research area is divided into three districts according to the physiognomy and the terrain: the northwest low mountainous area, north hilly area and northeast low mountainous area.

首先在空间上依据地形、地貌划分出三个区域：西北部低中山区、北部丘陵区和东北部低中山区。

youdao

Echelon model was built based on the box model and imported modified terrain coefficient, according to the characteristic of mountainous area.

根据复杂山区地形的特点，以箱模式为基础，引入地形修正系数，建立梯形模型。

youdao

It is an area where we have a favourable mountainous terrain, a good mass base, plenty of room for manoeuvre, and full guarantee for security.

此区地形险要，群众条件好，回旋地区大，安全方面完全有保障。

youdao

She says the work still is not easy, though,considering this is the country's worst flooding in more than 80 years and the area's mountainous terrain can make transportation difficult, even in the best of weather.

VOA: standard.2010.08.02