in a way that is able to succeed or to work as intended

The challenge to me as a manufacturer is to run the company viably. 作为制造商，我面临的挑战是如何让公司顺利运作。

It doesn't have enough bedrooms to run viably as a guest house. 这里没有足够的卧房，所以无法经营成合格的招待所。

in a way that is able to continue to exist or develop into a living being

The brain of the foetusbegins to function long before it can exist viably outside the womb. 在有能力在子宫外存活之前，胎儿的大脑早就已经有功能了。

If the process is interrupted, the egg cannot develop viably. 如果这一过程被打断了，卵子就无法发育存活。