flawless

The pianist gave a flawless performance, hitting every difficult note with precision.

(Chinese) 钢琴家带来了完美的演奏，精准地弹奏出了每一个高难度音符。

After hours of polishing, the antique mirror had a flawless, mirror-like shine.

(Chinese) 经过数小时的打磨，那面古董镜子呈现出完美如镜的光泽。