effectual

Quinine is an effectual preventive for malaria.

奎宁是有疟疾预防药。

They are almost as expeditious and effectual as Aladdin’s lamp.

他们几乎像如意神灯那么迅速有。

The research shows that the FA-goethite coexistensive system is quite effectual in the way of controlling the heavy metal pollution of cadmium.

因此，针铁矿-富里酸共存体系对于控制重金属镉污染具有较好。