1.at last 最后；终于

Dart, who had at first been very tense, at last relaxed.
起初，达特非常紧张，最后终于放松了下来。

At last Andrew gave them a crumb of information.
最后，安德鲁向他们透露了一点信息。

2.happen to 碰巧；发生；偶然

Do not wait for good things to happen to you. You need to walk towards happiness.
不要等待好事降临，你要向幸福进发。

If you happen to talk to him, have him call me.
如果你碰巧能和他说话，让他给我打个电话。