| 不 |
bù zhī suǒ zhōng | (idiom) to vanish without a trace; to go missing |
| 不 |
bù | no; not so / (bound form) not; un- |
| 不 |
bù zhī | not to know / unaware / unknowingly / fig. not to admit (defeat, hardships, tiredness etc) |
| 知 |
zhī | to know / to be aware |
| 所 |
suǒ | actually / place / classifier for houses, small buildings, institutions etc / that which / particle introducing a relative clause or passive / CL:个 |
| 终 |
zhōng | end / finish |