Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
landfill – n. a system of trash and garbage disposal in which the waste is buried between layers of earth to build up low-lying land
criteria – n. a standard on which a judgment or decision may be based
prospect – n. the possibility that something will happen in the future : an opportunity for something to happen
stagnant – adj. not active, changing, or progressing
