Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
barrel – n. a large, round container often used to hold liquid
sibling – n. a brother or sister
conceive – v. to become pregnant
survey – n. an activity in which many people are asked a question or a series of questions in order to gather information about what most people do or think about something
contaminate – v. to make something dangerous, dirty, or impure by adding something harmful to it
inhale – v. to breathe in
thief – n. a person who steals something
respond – v. to say or write something as an answer to a question or request
