viable：able to be done, or worth doing
可行的，值得做的=effective, feasible
例句：Starbucks' new store in this fourth-tier city has proved commercially viable.
例句：Renewables are economically viable alternatives.
翻译：As China’s economy is going downhill, many O2O business modes seem no long viable.
造句：The traditional making method no longer seem viable in this factory.
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