Starvation is a big problem in undeveloped countries.
饥饿在不发达国家是个很严重的问题。
I think developed countries should help undeveloped countries.
我认为发达国家应该帮助不发达国家。
System factor is mainly composed of social system of undeveloped countries and the international economic system.
制度性因素主要由不发达国家自身制度和国际经济制度构成。
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