来自拉丁语vita,生命，存活，字母t脱落，词源同vital,vitamin.

1. Their defense markets are too small to sustain economically viable production runs.

他们的国防市场太小，就经济可行性而言不足以维持生产。

2. Cash alone will not make Eastern Europe's banks viable.

仅靠现金不能使东欧的银行维持下去。

3. Five viable pregnancies were established.

已确定5个胎儿能够成活。

4. The factory is no longer economically viable.

这个工厂在经济上已经维持不下去了。

5. It is only their investment that makes the programme economically viable.

因为他们的投资,这个项目在经济上才得以通过.