Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
park - n. a piece of public land in or near a city that is kept free of houses and other buildings and can be used for pleasure and exercise
cliff - n. a high, steep surface of rock, earth, or ice
shield - n. a large piece of metal, wood, etc., carried by someone (such as a soldier or police officer) for protection
pueblo - n. group of Native American homes that have flat roofs and that were used in the past in the southwestern U.S.
unfortunate - adj. having bad luck
