It 's axiomatic that investing in young , unproven companies involves a great deal of risk .

不言而喻，投资年轻、资历尚浅的企业需承担很大的风险。

In short , stock prices are rising on an unproven , if promising , business model .

一句话，目前股价上涨的基础是是一个尽管前景看好、但尚未经过验证的商业模式。

Critics say the technology is unproven .

批评人士说，该技术未经证实。

Avoid reliance on new , unproven technology .

避免依赖新的，没有证明过的技术。

Still , the business model for successful rural lending remains unproven .

但向农村放贷这种经营模式是否能取得成功尚待验证。