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》
2
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》
3
Although dopamine is often associated with the experience of pleasure-it represents "rewards," such as chocolate cake or crackcocaine-it also helps make us want stuff.