他长年累月在大西北从事野外工作。

Year in year out he has been doing fieldwork in the Northwest.

河西地区是甘肃省重要的农业生产基地，全国十二大商品粮基地之一，在大西北开发和建设中具有十分重要的地位。

Hexi Corridor plays a very import part in the national economy of Gansu Province. It is the main agricultural production base of Gansu and it is one of the 12 commodity food grain bases in China.

这首敕勒歌风格奔放、雄健质朴，寥寥几句就十分生动地勾勒出内蒙大西北独特的壮丽景色。

Plain, vigorous and unrestrained in style, this folk song with only several lines gives a vivid outline of the unique and magnificent scenery in the vast northwest of Inner Mongolia.