freeairadj.大气的(自由空间)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 corrosion potential自腐蚀电位free piston installation自由活塞装置freehand figure painting写意人物画free flap transplantation游离皮瓣移植free from double jeopardy免受双重危险freezing-thawing cycles冻融循环Free-Fall Practice Bomb自由下落训练弹freezing insurance policy[经] 冻结保险单free-flight wind tunnel自由飞行风洞Free Cash Flow Hypothesis