慢速英语:河马宝宝已成为一支教育力量

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symbol – n. an action, object, or event that expresses or represents a particular idea or quality

merchandise – n. goods that are bought and sold

library – n. a place where books, magazines, and other materials, such as videos and musical recordings, are available for people to use or borrow

bloodstream – n. the flow of blood that moves through the heart and body

mission – n. a task that you consider to be a very important duty

lesson(s) – n. an activity that you do in order to learn something

bathtub(s) – n. a large and long container in which people clean themselves with soap and water

grade(s) – n. a level of study that is completed by a student during one year

gobble – v. to take something quickly or suddenly

habitat(s) – n. the place or type of place where a plant or animal naturally or normally lives or grows