VOA慢速英语:首届中国国际进口博览会开幕

implement -v. to begin to do or use (something, such as a plan) : to make (something) active or effective

tariff -n. a tax on goods coming into or leaving a country

skew -v. to change (something) so that it is not true or accurate

rank -n. to place (someone or something) in a particular position among a group of people or things that are being judged according to quality, ability, size, etc.