adj.有效果的；有法律效力的；有實(shí)效的

Quinine is an effectual preventive for malaria. 奎寧是有效的瘧疾預(yù)防藥。

The government hasn't worked out the effectual measures to combat unemployment. 政府還沒有找出對付失業(yè)的有效措施。

The practice has shown that the monitoring system is effectual. 實(shí)踐表明,該監(jiān)督控制系統(tǒng)是行之有效的。

He felt his way to effectual practice through a multitude of trials and misconceptions. 經(jīng)過多次嘗試和誤解,他在實(shí)踐中摸索前進(jìn)。

adv.有效地

adj.（東西）無效的；無益的；白費(fèi)的；（人）無能的

adv.無效地；無益地