我最好的一天是未知的。
But, who is behind the scenes, unknown yet.
然而，幕后黑手到底是谁，仍不得而知。
The aetiology of AD remains unknown and as yet, there is no known cure.
由于AD发病机理十分复杂，迄今为止尚不清楚，因此尚无理想的防治药物问世。
The reason why he was late is unknown yet.
他为什么迟到的原因不清楚。
Whether the singer can come or not is unknown yet.
那个歌手是否能来不知道。
It takes me by surprise, and yet is not unknown.
惊奇之余，却不感意外。
It takes me by surprise, and yet is not unknown.
惊奇之余，却不感意外。
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