VOA慢速英语:Changing Arctic Conditions Threaten Polar Bears

deprived – adj. to not have something

stressed – adj. related to strong feelings or concerns

physiologically – adv. of or relating to the body

hibernate – v. to spend the winter sleeping or resting

incapable – adj. not able to do something

metabolic rate – n. the rate at which a living thing (animal, people) turns food into energy

reverse – v. to cause something to stop or return to an earlier state

trend – n. a general direction of change; a way of behaving

greenhouse gases – n. gases blamed for the greenhouse effect, which is defined as the warming of the atmosphere by air pollution

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