我们所能确定的就是它们曾经生存过。

All that we can be sure of is that once they lived.

youdao

如果您曾经接触过CORBA，就会明白这种能力的重要意义，以及在特定项目中对J2EE服务器生存能力的影响。

If you're already initiated into CORBA, you know the importance of this capability and how it may affect the viability of a J2EE server for a particular project.

youdao

至少我曾经体验过，不过我从来不靠它生存。

So at least it's something I experience, but that's not where I live.

youdao