They may also begin to need to do more and more of the activity over time to feel the effects, and experience physical and psychologicalwithdrawal symptoms if they can't do it.
More than physical tolerance, an addiction develops physical and psychological dependence separate from the need to avoid the pain of withdrawal.
除生理上的耐受(药)性之外,上瘾会形成不同于逃避戒除痛苦需要的生理和心理上的依赖性。
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Withdrawal state: it is the physiological and psychological symptoms occurring after stopping using or reducing the dose of certain drug or using antagonist to occupy the receptor.