freebeen.免费赠品(尤指戏院赠券)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-radical scavenging activity自由基清除活性free-space optical communication自由空间光通信free lever type relay interlocking自由手柄式继电(集中)联锁free fiber optic coupler connector非安装式光纤耦合连接器free air gravity free oscillationsn.自由空间(空气)自由(激)振盈free front support scale crossways俯平衡两臂侧举free and comprehensive development人的自由全面发展Free radical scavenging ac-tivity自由基清除活性free category with semigroup action自由半群作用范畴Freezing-induced phase separation冷冻相分离法