这个计划听起来很好，但在有限的时间内是否可行还需要验证。

The plan sounds good, but we need to verify if it's ___practicable within the limited time.

这个方案在理论上是可行的，但我们还需要测试它是否实际可行。

The plan seems good in theory, but we need to test if it's ___practicable in reality.