Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
hire – v. to give work or a job to (someone) in exchange for wages or a salary
substitute – n. a person or thing that takes the place of someone or something else
benefit – n. money that is paid by a company or by a government when someone dies, becomes sick or stops working
staff – v. to supply (an organization or business) with workers
librarian – n. a specialist in the care of books, magazines, documents and other records
