联合国：阿富汗鸦片产量下降

drought – n.a long time without rain

heroin – n.a powerful illegal drug that is made from opium

province –n.an area of a country

entrench – v.to put oneself in a strong defensive position

funding– n.financing

beyond– prep.on the farther side of; in a larger amount

challenge– n.a difficult problem or test

cultivation– n.the act of growing and harvesting a crop

potential – n.something that can happen

per – adv. for each