数年 數年

    shùnián

    1. Noun Formalseveral years; many years

    经过数年的努力,这项技术终于突破了瓶颈。Jīngguò shùnián de nǔlì, zhè xiàng jìshù zhōngyú tūpò le píngjǐng.After years of effort, the technology finally broke through the bottleneck.