nà / běn / zhòng / yào / de / wén / jiàn / tū / rán / bù / zhī / qù / xiàng / dà / jiā / zhǎo / le / bàn / tiān / yě / méi / zhǎo / dào

那本重要的文件突然不知去向，大家找了半天也没找到。

That important document suddenly went missing, and no one could find it after searching for a long time.