近义词是basically,essentially,in fact,effectively,to all intents and purposes,中文意思是实际上生效

Their strategy is expansionist and imperialist, and it is greatest in effect, of course, when there is no countervailing power.

他们的战略是扩张主义的和帝国主义的,当然,它在没有抗衡力量的时候就会达到最大效果。