5.tobacco smoke is the most effectual protection against the midge.
烟草烟雾是防小蚊最有。
6.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。
7.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果。
8.a fine sense of rhythm that helped (or aided ) the student in learning music. Help, however, sometimes conveys a stronger suggestion of effectual action:
批评；
, 收
护
。
