有时，人们喜欢毒品或非常需要毒品，他们离不开毒品。
Sometimes, people like drugs or need drugs so much; they can't do without them.
一个人肥胖总会离不开过度饮食吧。但为什么人又会过度饮食呢？
You can't get obese without overeating, but why do people overeat?
Shatkin说，“想一下人类基本的需求，也就是那些我们离不开的东西。”
"Think of basic human needs, the things we can't do without, " says Shatkin.
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