The used car that I bought was in A-1 condition.

‘A-1 condition’ is an American figure of speech which means something being in the best condition possible.

我買的那輛中古車，性能極佳。

A-1 condition 指狀況特佳、性能「一等一」「一級棒」的意思。這也是美國式的修辭，一種比喻的說法。