经济不发达国家 meaning in English

underdeveloped country

Earthquake is the most serious paroxysmal natural disaster for people . it ' s urgent to take economical and effective measurement in improving the aseismatic capability of building which have been built or will be built , especially for our country , a ldc where earthquake is frequent
地震是人类所面临的最严重的突发性自然灾害，我国作为一个地震多发的经济不发达国家，采取经济、有效的措施提高已建和拟建建筑的抗震能力是亟待解决的问题。