慢速英语:美国官员争论边境的移民问题

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challenge –n. a difficult task or problem

recklessly –adv. not showing proper concern about the possible bad results of your actions

eliminating –v. to remove something

absolutely –adv. completely or totally

humane –adj. kind or gentle to people or animals

smuggle –v. to move (someone or something) from one country into another illegally and secretly

vulnerable –adj. open to attack, harm, or damage