这项成果背后是科研人员多年的艰辛努力。Zhè xiàng chéngguǒ bèihòu shì kēyán rényuán duō nián de jiānxīn nǔlì.Behind this achievement lie many years of arduous effort by researchers.
为了养大三个孩子,母亲度过了艰辛的岁月。Wèile yǎngdà sān gè háizi, mǔqīn dùguò le jiānxīn de suìyuè.To raise three children, the mother lived through years of hardship.
登山的路程很艰辛,但山顶的风景让人忘记了疲劳。Dēngshān de lùchéng hěn jiānxīn, dàn shāndǐng de fēngjǐng ràng rén wàngjì le píláo.The climb was arduous, but the view from the summit made everyone forget their tiredness.