Yǒu le duōnián de jīngyàn, tā chǔlǐ fùzá wèntí jiàqīngjiùshú.
With years of experience, she handles complex problems effortlessly.
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The idiom comes from the image of driving a light carriage (驾轻) on a familiar road (就熟). When the carriage is light and the road is known, the driver needs little effort. It describes the ease that comes from experience and familiarity.