active dye活性染料activeadj.活跃的；积极的；起作用的；灵活的active standby transmitter热备用发射机active fault in urban area城市活断层active magnetic suspension有源磁悬浮active interest management主动兴趣管理active aldehyde-function活泼醛基Active composition in soil土壤活性物active stretching exercise主动牵伸运动active return loss of echo回波有功损耗active suppressing jamming有源压制干扰active chain end mechanism活性链端机理