结果令人失望，至少可以这么说。

The results were disappointing, ___to ___say ___the ___least.

这场讲座有些令人困惑，至少可以这么说。

The lecture was somewhat confusing, ___to ___say ___the ___least.

他的反应，至少可以说，出人意料。

His reaction was, ___to ___say ___the ___least, unexpected.