I think that is about as far as we can go.
我想就到此为止吧。
结束会议：

Let's leave it there for today.
我们今天就谈到这儿吧。
I am afraid we will have to stop here.
恐怕我们得到此为止了。
Why don't we finish for the day?
今天我们就到此为止吧？

It has been a very fruitful discussion.
这是一次富有成效的讨论。
教对会议进行肯定评价：

It has been a very useful discussion.
这是一次非常有用的讨论。
it has been a very productive discussion.
这是一次非常富有成效的讨论。