有效的；起作用的；实际的，实在的；给人深刻印象
[军]现役兵额，有生力量，精兵；
复数：effectives
"an air-cooled motor was more effective than a witch's broomstick for rapid long-distance transportation"; "effective teaching methods"; "effective steps toward peace"; "made an effective entrance"
同义词：effectualefficacious
"people who will do nothing unless they get something out of it for themselves are often highly effective persons..."; "effective personnel"
同义词：efficient
"an effective reprimand"; "a lotion that is effective in cases of prickly heat"
"the law is effective immediately"
同义词：goodin effect(p)in force(p)
"a decline in the effective demand"; "confused increased equipment and expenditure with the quantity of effective work done"
"the fort was held by about 100 effective soldiers"
effective management有效管理
effective measure有效措施
cost effective有成本效益的；划算的；成本效率
effective rate实际比率；有效利率
become effective开始生效；变为生效
effective stress有效应力
effective utilization有效利用
effective demand n. 有效需求
effective date有效日期；生效期
effective supply有效供给；有效供应
effective action有效行动；有效作用量
effective work有效工作，有效劳动
effective from生效日期；自…起生效
effective length有效长度；计算长度
effective thickness有效厚度；有效壁厚
effective mass[电]有效质量
effective power有效功率
effective index有效折射率
effective value有效值，实际值
effective permeability实际渗透率
这组词都有“有效的”的意思，其区别是：
efficient “效率高的”，“有能力的”，用以指人或物，着重有效地利用时间、精力并取得预期效果。如：The German telephone system is highly efficient. (德国的电话系统效率很高。)
effective 常用以指物，强调能产生某种预期的效果。如：effective medicine, effective method等。
