VOA慢速英语:Facebook推出儿童版社交软件

account – n. an arrangement in which a person uses the Internet or e-mail services of a particular company

bullying – n. the mistreatment or abuse of someone by a stronger or more powerful individual

encourage – v. tell or advise to do something

clarify – v. make something easier to understand through explanation

psychological – adj. of or relating to the mind