viable可行的

1) 搭配:

~ project/product/idea

/programme

economically/commercially/perfectly

2)  As China's economy is going downhill, many online-to-online (O2O) businesses no longer seem commercially viable.

3) 例子: It's too hard to give a perfectly viable idea.

  场景: 最近遇到有几项束手无策的工作。

4) Takeaways:

    the fourth-tier city四线城市

    同义替换:  effective/feasible/viable