3. 怎样学会使用这个词？
1）使用《牛津英语搭配词典》查“viable”，了解它作为形容词时的常用搭配。
viable adj.
VERBS be, prove, seem, sound None of the projects proved financially viable.
| become | remain | make sth It is only their investment that makes the programme economically viable.
| consider sth, regard sth as
ADV. extremely, truly | perfectly a perfectly viable form of political organization
| potentially | still | no longer | commercially, economically, financially
2）翻译下面的句子：
中国经济下行，许多 O2O 模式显得不再可行。
As China’s economy is decreasing, many O2O business models seems to be not viable.
参考翻译：As China’s economy is going downhill, many online-to-offline (O2O) businesses no longer seem (commercially/economically) viable.
3）结合自己的生活、学习、工作、兴趣等，想象在什么语境下会用到这个表达。先简要描述这个场景，再造句。
例子： After reading and researching, none of these dissertation topics are potentially viable.
场景 ：经过资料查找，这些论文题目似乎都不可行