我见过总统——至少，他和我握过一次手。

I've met the President - ___at ___least, he shook my hand once.

热狗滑雪很有趣。至少，人们是这么说的。

Hot-Dog skiing is fun. ___At ___least, that's what people say.

这个项目很有挑战性，但至少我们学到了很多。

The project was challenging, but ___at ___least we learned a lot.