cost-effective

They are not cost-effective if applied to all patients.

如果应用到所有病人他们是不划算的。

They also see it as a symbol of their taste, rather than simply a cost-effective piece of hardware.

他们也把手机看作是自己品味的象征，而不仅仅只是一块划算的硬件。

There's also no better antidote to those European winter blues, but if you want to go at the most cost-effective time, go just before the Australian Open starts.

目前对于欧洲冬季抑郁还没有更好的解药，但是如果你想赶在最划算的时候去澳洲，那就赶在澳网之前吧。