单词	二级周期--二级循环
释义	二级循环，二级周期second-order cycle
随便看	parallel planar texture-- simple planar texture parallel planar texture; simple planar texture parallel plane parallel-plane capacitor parallel planeing parallel plane polariscope parallel plane s parallel planes parallel planing machine parallel plate parallel-plate parallel-plate actuator parallel-plate capacitor parallel plate cell parallel plate chamber parallel-plate chamber parallel-plate--chamber parallel plate condenser parallel-plate condenser parallel-plate counter parallel-plate--counter parallel-plate discharge parallel plate domain structure parallel plate electrode parallel-plate--electrodes