activity Web动态网站activityn.活动；活跃vt.表演adj.厉害Activity-based view活动基础观activity control form活动控制形式activity-on-arrow双代号网络activity-identifier活动识别符activity-based cost作业成本Activity Support File机构保障档案activity optimization活动方式最佳化activity of education教育活动activity of component组元活度Activity of film-TV影视活动

1. A margin of freedom or variation, as of activity, time, or expenditure; latitude.
   余地，余裕自由或变化的余地，比如行动、时间或花费等; 回旋余地