developing country
US /dɪˈvel.ə.pɪŋ ˈkʌn.tri/
UK /dɪˈvel.ə.pɪŋ ˈkʌn.tri/

1.
発展途上国
a country with a less developed industrial base and a low Human Development Index (HDI) relative to other countries
:
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Many international organizations provide aid to developing countries.
多くの国際機関が発展途上国に援助を提供しています。
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Improving education is crucial for the growth of developing countries.
教育の改善は発展途上国の成長にとって不可欠です。