Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
nationwide – adj. including or involving all parts of a nation or country
vision – n. a clear idea about what should happen or be done in the future
fail-safe – adj. certain not to fail; capable of compensating automatically and safely for a failure
qualification – n. a special skill or type of experience or knowledge that makes someone suitable to do a particular job or activity (usually plural)
hack – v. to secretly get access to the files on a computer or network in order to get information, cause damage, etc.
convince – v. to cause (someone) to agree to do something
