VOA慢速英语:公共汽车成了移民儿童的学校

migrant – n. a person who goes from one place to another especially to find work

dozen – n. a group of twelve people or things

vulnerable – adj. easily hurt or harmed physically, mentally, or emotionally

tent – n. a portable shelter that is used outdoors, is made of cloth (such as canvas or nylon), and is held up with poles and ropes

accredited – v. to say that something is good enough to be given official approval