I think we can end the meeting now.
我认为我们现在可以结束会议了。

宣布会议结束:
I think we should stop there.
我想我们可以到此结束了。
I am sure we can close the meeting now.
我们现在可以结束会议了。

Thanks for your participation.
感谢你们的参与。

致会议的结束语：
Thanks, everyone, for coming.
感谢大家的到来。
It has been a pleasure to see you today. I will see you later.
今天很高兴见到大家。再见。