The speed of integration in international trade of LDCs (Least Developed Countries) has been slow.

融入国际贸易的速度，就最不发达国家而言，一直是缓慢的。

youdao

Formulate project proposals and mobilise extra-budgetary resources to support operational projects for the benefit of Least Developed Countries (LDCs), with emphasis on multidisciplinary and science policy projects.

UNESCO: Vacancy : Senior Programme Specialist (24/5/2011) (SC 433 - (P5))

There are a heck of a lot of them - the Alliance of Small Island States (Aosis) and the Least Developed Countries bloc (LDCs) have more than 70 members combined.

BBC: Durban: Winners and losers