A more cost effective solution is required.

因此我们需要更加行之有效的解决方案。

Q: Is building earthquake-safe hospitals cost effective?

问：建造抗震医院是否具有成本效益？

They are, however, far more cost effective than supersonic fighter jets.

然而大雄蜂无人机比超音速战斗机更有成本效率。

The reason for this is simple: it's much more efficient and cost effective.

原因很简单：这个解决方案更为高效且节约成本。