Daily Chinese Idiom Guessing Game
Cannot find out; unable to learn the truth about something.
得能够。没有办法知道。
《后汉书·桓谭传》盖天道性命，圣人所难言也。自子贡以下，不得而闻。”唐·韩愈《争臣论》故虽谏且议，使人不得而知焉。”
The details of the negotiation remain unknown to the public; we simply cannot obtain and know them.