activity Web动态网站activityn.活动；活跃vt.表演adj.厉害activity firm leader领导activity coefficient占空系数,活度系数Activity intolerance活动耐受不良(指明水平)activity unit design活动单元设计activity concurrency活动并发activity declaration活动说明activity measurement放射性活度测量activity-dependent功能(活动)依赖性activity of catalase过氧化氢酶活性activity of bacteria细菌的活动