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Three Mile Island
     
Three Mile Island
a nuclear power station in Pennsylvania in the US, where there was a serious accident in 1979. The people in charge managed to prevent a meltdown (=when the nuclear material melts and burns through its containers), but the accident increased opposition to nuclear power in the US and prevented new power stations from being built.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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