At the end of the day, we were tired but happy.
那天结束时，我们很累，但很快乐。
Excuse me, but may I use your phone?
对不起，我可以借用你的电话吗？
I had no other choice but to eat out.
我没有别的选择，只能在外面吃饭。
There’s no one here but me.
这里除了我没别人。
He is but a child.
他只是个孩子。
He left but an hour ago.
他一小时前才离去。
But for your help, I could not have succeeded.
如果没有你的帮助，我不可能成功。
She speaks very good English. But then she did live in London for two years.
她英语讲得很好，不过她毕竟在伦敦生活过两年。