Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
frustrate – v. to make ineffectual; bring to nothing; to prevent from succeeding
maximum – adj. the greatest amount or value of something
appeasement – n. the act of pleasing someone by giving or something desired
stance – n. position
currency – n. the money that a country uses
income – n. money that is earned from work or business
sanction – n. a measure designed to punish someone or something
tariff – n. a tax
retaliation – n. the act of repaying in kind; taking action against someone
