The movie was boring, but at least the seats were comfortable.

at 是介词，表示"在...方面"或"处于某种状态"。 least 是形容词 little 的最高级形式，意思是"最少的"或"最小的"。 at least 是一个固定短语，表示"至少"，用来强调某个情况虽然不完美但仍有可取之处。