1.Television is an effective means of communication.电视是一种有效的通信手段。
2.It has been demonstrated that this drug is effective.这药已证实是有效的。
3.Cooperative activity is essential to effective community work.要把社区工作做好，协作活动是必不可少的。
匿名回答于2022-04-20 18:17:36
