impeccable

The waiter provided impeccable service, attending to our every need without being intrusive.

(Chinese) 侍者提供了完美无瑕的服务，在不打扰我们的情况下满足了我们的每一个需求。

She performed the difficult piano concerto with impeccable technique.

(Chinese) 她以无懈可击的技巧演奏了那首高难度的钢琴协奏曲。