虚拟平台下英语教学信息资源存在质量不确定性。
The quality of English teaching resources based on a virtual platform is uncertainty.
国外学者习惯于将不对称信息问题划分为逆向选择与道德风险两大类，并直接把质量不确定性问题并入到逆向选择问题中。
Many foreign scholars tend to categorize information asymmetry into two classes-adverse selection and moral hazard-and the former is a direct blend of quality uncertainty.
在经过对各种不确定性因素评估后，发现没有一个双星系统中存在2 - 5个太阳质量的黑洞。
None of them had a black hole of 2-5 solar masses living there, even after observational uncertainties were considered.
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