慢速英语:China Races to Find Ferry Accident Survivors

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trap – v. to cause (a person or animal) to be unable to move or escape from a dangerous place

base –n. the main place in which a person works or lives or a business operates

grenade – n. a small bomb that is designed to be thrown by someone or shot from a rifle

surveillance – n. the act of carefully watching someone or something especially in order to prevent or detect a crime