for sure简单

No one knows for sure when poetry began but it has been around for thousands of years, even before people could write.

没有人确切知道诗歌起源于何时，但它已经存在了数千年，甚至在人类会书写之前就已存在。

But the one thing we know for sure is that with each advance in globalization and the I.T. revolution, the best jobs will require workers to have more and better education to make themselves above average.

但我们可以确定的一点是，随着全球化和信息技术革命的每一次推进，最好的工作将要求劳动者接受更多更好的教育，使自己高于一般水平。