灾后重建任务十分艰巨,不可能靠一两次捐款彻底解决。Zāihòu chóngjiàn rènwu shífēn jiānjù, bù kěnéng kào yì liǎng cì juānkuǎn chèdǐ jiějué.The task of post-disaster reconstruction is extremely arduous and cannot be solved completely with one or two donations.
一个人完成这么多工作,任务太艰巨了。Yí ge rén wánchéng zhème duō gōngzuò, rènwu tài jiānjù le.For one person to finish this much work, the task is too daunting.
清理整座山的垃圾是一项艰巨的工作。Qīnglǐ zhěng zuò shān de lājī shì yí xiàng jiānjù de gōngzuò.Clearing the rubbish from a whole mountain is an arduous job.