at [sb.'s] best
释义：“登峰造极的程度”，形容人的话则是“花样年华”或是“最好的一面”。
例句：
We want to motivate people to stay in shape and perform at their best.
This is home-style Vietnamese cooking at its best, from stunning chargrilled pork soft rolls, to vivid duck salad, to flash-fried chicken with crushed rice, cabbage pickle and a frizzly fried egg.