他们签订了一份无期限的合同。

They signed an open-ended contract.

这个项目是无期限的，我们可以慢慢来。

This project is open-ended, so we can take our time.

他的假期是无期限的，他可以随时回来。

His vacation is open-ended, and he can return anytime.

讨论是无期限的，直到我们找到解决方案。

The discussion is open-ended until we find a solution.

这次会议是无期限的，所以我们可以随时结束。

The meeting is open-ended, so we can end it anytime.

不要让工作无期限地进行下去。

Don't let tasks go on indefinitely.

公司可以无期限的持有或重新发行或注销。

The corporation can hold this stock indefinitely or can reissue or retire it.

这是可以无期限地（或永远或没有终点的）持续下去的。

This can continue indefinitely (or forever or without end).