慢速英语:为什么美国的预期寿命会下降？

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overdose - n. an amount of drug or medicine that is too much and dangerous

sibling - n. a brother or sister

outcome - n. something that happens as a result of an activity or process

obesity - n. the problem of very fat

opioid addiction - n. a strong harmful need to use pain-killing drugs

knock off - v. to remove or stop something

fund - v. to provide money