Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
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.
