VOA慢速英语:President Obama Urges More Open Ethiopia

opposition – n. a political party that is trying to replace the political party in power

index – n. a number that indicates changes in the level of something (such as a stock market) when it rises or falls

sell-off – n. the sale of a large number of stocks or shares that causes their price to drop

negotiation(s) – n. formal discussions between people who are trying to reach an agreement