这份手稿为何被长期封存,至今仍不得而知。Zhè fèn shǒugǎo wèihé bèi chángqī fēngcún, zhìjīn réng bùdé'érzhī.Why this manuscript was sealed away for so long remains unknown to this day.
他为什么突然搬走,我们不得而知。Tā wèishénme tūrán bānzǒu, wǒmen bùdé'érzhī.Why he suddenly moved away, we have no way of knowing.
比赛最后谁会赢,现在还不得而知。Bǐsài zuìhòu shéi huì yíng, xiànzài hái bùdé'érzhī.Who will win the match in the end is still unknown.