动词 free-base:

1. use (purified cocaine) by burning it and inhaling the fumes

Freethyn.弗里西freeadj.自由的；免费的；畅通的；没有…的；未使用的；空闲的；随意的v.释放；使自由；使摆脱；解除；使可用于(某目的)adv.免费地；自由地free cord indicator空闲塞绳表示器free metal particle自由金属粒子Freed the slaves.答：解放了奴隶。free from sentiment不带感情,不夹杂个人好恶free variable value[计] 自由变量值Free Weft Selecting自由选纬free seating ticket非预订的座位票free shear- layer自由剪切层freezing thermostat冷冻恒温器freely falling body自由落体

1. The preparation of tetramisole free alkali was studied with antiaddition method.
   采用反加法对四咪唑游离碱的制备进行了实验研究。