addiction v. addicted v. addictive三者如何区分！
1. addiction: /əˈdɪk.ʃən/
【英文释义】an inability to stop doing or using something, especially something harmful
【中文释义】上癮
例：
drug addiction 吸毒上癮
his addiction to alcohol: 他對酒精上癮。
For people with OCD, cleaning can become an addiction. 對于強迫症患者來說，做卫生可能會成為一種癮。
2. addicted：/əˈdɪk·tɪd/
【英文释义】 unable to stop taking drugs, or doing something as a habit
【中文释义】入迷的；上癮的
addicted to：常有贬义，后接名词、代词或者动词的-ing形式。
例：
He is addicted to drugs.他吸毒成瘾。
She was addicted to TV. 她看电视上了瘾。
By the age of 14 he was addicted to heroin. 他14歲的時候，已經吸食海洛因上了癮。
I'm addicted to (= I very often eat) chocolate. 我吃巧克力上了癮。嗜吃巧克力。
I know that if I start watching a soap opera I immediately become hopelessly addicted.
我知道自己只要一開始看連續劇，就會馬上上癮，無法自拔。
3. addictive：/əˈdɪk·tɪv/
【英文释义】 An addictive drug is one that you cannot stop taking once you have started.
An addictive activity or food is one that you cannot stop doing or eating once you have started.
【中文释义】使人上癮的；
（活動或食品）使人上癮的，使人入迷的
例：
Tobacco is highly addictive.
煙草極易使人上癮。
Video games can be addictive.电子游戏会让人上瘾。
addictive drugs; addictive behavior.
令人上瘾的毒品；成瘾的行为。
4. additive v. addicted:
additive侧重于形容物，指事物使人上瘾；sth. is ~.
addicted侧重于形容人, 指人对事物有瘾；sb. is ~ to sth.
例：
He’s addicted to tobacco. 他对烟草有瘾。
Tobacco is highly addictive. 烟草很容易使人上瘾。
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