Based on my tests of its prerelease, or beta, version, Windows 7 will be a huge improvement.

根据我对Windows7的预先演示版，即测试版的测试，它将会有很大的改进。

youdao

Based on my tests of its prerelease, or beta, version, Windows 7 will be a huge improvement.

根据我对Windows7的预先演示版，即测试版的测试，它将会有很大的改进。

youdao