对于复杂的系统，不确定通常是一个程序在开发的早期阶段面临的最大的风险。

For complex systems, uncertainty is usually the biggest risk a program faces in the early stages of development.

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我不确定从免费音乐下载应用程序上下免费下载音乐是否合法，但我能肯定的是搜索一下就能得到如此多的文件是十分方便的。

I'm not sure how legal the free downloads from the FreeMusicDownloader app are, but it sure is convenient to have so many files just a search away.

youdao

这在大多数国家是标准程序，通常不确定会去投票者的回答会被减少比重或完全排除。

This is standard practice in most places, and the responses of those who say they are not sure are usually weighed more lightly or discarded altogether.

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