permanent lag固定延迟permanentadj.永久的；持久的n.<口> 烫发permanent-magnetic chuck永久磁性吸盘permanent-magnet ammeter永磁式安培计permanent-magnet twister永久磁扫线Permanent bladder catheter永久导尿管permanent magnets bearings磁力轴承Permanent Part-Time Work永久性兼任工作Permanent magnetic AC servo永磁交流伺服permanent-capacitor motor永久电容器式电动机permanent magnetic DC motor永磁直流电动机permanent hardness of water水的永久硬度,永久硬度