VOA慢速英语:Robot Finds Unexploded Underwater Mines

autonomously – adv. existing or acting separately from other things or people

challenge – n. a difficult task or problem; something that is hard to do

hands-on – adj. gained by actually doing something rather than learning about it from books, lectures, etc.

mine – n. a bomb that is placed in the ground or in water and that explodes when it is touched

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