boom –v. to grow or expand suddenly

vaccine –n. a substance that is usually injected into a person or animal to protect against a particular disease

dose – n. the amount of a medicine, drug or vitamin that is taken at one time

tourist –n. a person who travels to a place for pleasure

attract –v. to cause (someone) to like or be interested in something

change hands –v. to move in ownership from one person to another
 2/3   首页 上一页 1 2 3 下一页 尾页