nǐ / shuō / yào / zài / yì / tiān / nèi / wán / chéng / zhème / dà / de / xiàng / mù / jiǎn / zhí / shì / chī / rén / shuō / mèng

你说要在一天内完成这么大的项目，简直是痴人说梦。

Saying you can finish such a huge project in one day is pure nonsense.