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1.drug addiction 药物成瘾，毒瘾
例句：She stood by him as he spiralled into drug addiction.
她支持他当药物成瘾无法自拔时。
2.is extracted from 从...中提取
例句：This substance is extracted from seaweed.
这种物质是从海藻中提取的。
3.account for 占...比例，解释
例句：How do you account for this.
你对这件事怎么解释?
