外界仍不得而知 The Outside Still Unknown
但如何仍然不得而知 But How Remains Unknown
仍不得而知
Still unknown
以上为机器翻译结果，长、整句建议使用 人工翻译 。
提议的细节仍不得而知。
Details of the proposals remain secret.
《牛津词典》
但更长远地看，哪种预测会是对的仍不得而知。
Longer term, though, it's still impossible to know which prediction will turn out to be right.
youdao
然而，这些人当中成为累犯的比率仍不得而知。
The rate of recidivism is not known.
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