我们知道成瘾行为与一些大脑的系统有关，但我们并不知道是什么维持着人对香烟的成瘾性。
A number of brain systems have been implicated in addictive behavior, but none have yet been shown to be necessary for maintaining the addiction to cigarette smoking.
我们知道成瘾行为与一些大脑的系统有关，但我们并不知道是什么维持着人对香烟的成瘾性。
A number of brain systems have been implicated in addictive behavior, but none have yet been shown to be necessary for maintaining the addiction to cigarette smoking.
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