不bat1得dak1而ji4知zi1

English

1. unknown
2. unable to find out; unknown
3. unable to find out

粵語 — Cantonese

1. 冇辦法知道

Examples

• 至於佢點解會喺日本就不得而知嘞。

  The reason why he's in Japan is anybody's guess.

• 这个计划能否成功还不得而知。

  It is yet to be seen whether this plan will succeed or not.

  Tatoeba · zhouj1955 CC BY

• 当然，那些热水瓶是不是他们自己的就不得而知了。

  Obviously, we don't know if those thermos flasks are their own.

  Tatoeba · sadhen CC BY