ㄩㄣˋㄩㄥˋˋㄖㄨˊyùnyòng‑zìrú

运用自如
  1. 形容運用熟練自然自如活動毫無阻礙)​。 爸爸雖然年紀操作電腦運用自如」。

to operate easily (idiom)​; to use freely, to have fluent command of, to have sth at one's fingertips