长时间的学习对他的成绩产生了积极的影响。

Long hours of study had a positive ___effect on his grades.

新的交通规则下周开始生效。

The new traffic rules will take ___effect next week.

舞台上那些视觉特效都是为了制造震撼效果。

The visual ___effects on stage were designed to create a stunning impression.

火灾过后，他们只能抢救出少量的个人物品。

After the fire, they could only salvage a few of their personal ___effects.