我见过首相——至少，我在一次招待会上和他握过一次手。

I've met the Prime Minister – ___at ___least, I shook his hand once at a reception.

这家餐厅应该很棒。至少，所有的评论都这么说。

The restaurant is supposed to be excellent. ___At ___least, that's what all the reviews say.

我想我理解了讲座的要点，至少，我希望我理解了。

I think I understood the main point of the lecture, ___at ___least, I hope I did.