Meaneyn.米尼meanv.意思是；打算；导致；意味adj.低劣的；刻薄的；卑鄙的；出色的；吝啬的；平均的；中等的n.平均值；平均数；中间；中庸mean annual efficiency全年平均效率mean - squared error均方误差mean square root error均方根误差mean maintenance power平均维护人力mean thermal sensation平均热感觉mean specific pressure平均比压mean blade width ratio平均叶径宽比,平均翼宽比Mean Rounds to Failure故障平均发数mean low-water neaps平均小潮低潮面mean-field parameter平均场参数

1. The average power is therefore zero.
   故平均功率为零。
2. Laser power beaming and propulsion, on the other hand, would require sustained average power output from lasers of megawatts to gigawatts.
   而激光传能及推进则要求激光器的持续平均功率输出在兆瓦到千兆瓦之间。