VOA慢速英语:Trending Today: White House Joins Snapchat

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ahead - adj. in or toward the front; before

behind-the-scenes - adj. working or happening privately, without being seen by the general public

stream - v. to transmit  video and audio material over the Internet

multitude - n. a large number

hinted - v. suggested

pets - n. animals keep around the house for fun or pleasure

engage - v. to win and keep the attention of someone or something

preserved - v. saved; protected