这些计划需要时间才会有收效。

These plans take time to come to fruition.

市场划分是提高广告收效的第三个因素。

Market segmentation brings us to the third factor that boosts advertising effectiveness.

商学院和法学院上的是大课，但是收效更佳。

Business and law schools achieve good results with big classes.

这也并不是说要大动干戈，只需简单的一些变化就能收效甚大。

This does not necessarily require a major overhaul. Simple changes can make all the difference.