VOA慢速英语:奥巴马和希拉里邮包惊现爆炸装置

potential –adj. able to become real

address –v. to write on an envelope, package or letter the name and address of the person it is being sent to

pipe bomb –n. a simple explosive device often in the form of a pipe

envelope –n. an enclosed cover for a letter

cowards –n. someone who is too afraid to do what is right or expected