Crack is a highly potent and addictive derivative of cocaine.

强效纯可卡因是一种药效极强、容易使人上瘾的可卡因制剂。

《牛津词典》

Crack is a much cheaper, smokable form of cocaine which is powerfully addictive.

强效可卡因是一种便宜得多的可吸食性可卡因，非常容易上瘾。

《柯林斯英汉双解大词典》

Although dopamine is often associated with the experience of pleasure-it represents "rewards," such as chocolate cake or crack cocaine-it also helps make us want stuff.

虽然多巴胺经常与愉悦感的体验——表现为“奖赏”，如巧克力蛋糕或者快克可卡因——联系在一起，但它也会使我们充满渴望。

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He appeared before St Helens Magistrates' Court on Saturday to face charges of possession with intent to supply cocaine, possession with intent to supply crack cocaine, and being concerned in the production of crack cocaine.

BBC: NEWS | UK | England | Merseyside | Ex-Everton player on drugs charge

Aidan Gray, a national coordinator for Coca, a support group on cocaine and crack cocaine issues, told BBC News Online that a successful vaccine could be a useful tool.

BBC: Cocaine vaccine trials progress

He said that Mr Harun sold cannabis and crack cocaine in Fishermead and Springfield while Mr Abdulkadir sold cannabis, heroin and crack cocaine in Springfield, Conniburrow and Fishermead.

BBC: Mohammed Abdi Farah and Amin Ahmed Ismail