China's relatively underdevelopedeconomy also plays a role.
中国相对不发达的经济也在发挥着作用。
2
Agricultural economy has been an essential part of the economy of underdeveloped counties.
农业经济是欠发达县域经济的重要组成部分。
3
But in the inland, especially in the countryside where economy and culture are relatively underdeveloped, graded teaching is difficult to be popularized and cannot show its great value.