This is a fact hitherto unknown.
这是一个至今无人知道的事实。
To carry out a hitherto unknown experience!
来进行一次前所未有的体验吧！
Whether they were alive or not, this was a riddle hitherto unknown.
他们是生是死，迄今还是一个谜。
As Booker won a battle, hitherto unknown achievement in his heart.
布克好像赢得了一场战役，前所未有的成就感流淌在他心里。
Others may need a little encouragement to buy fish hitherto unknown to them.
其他人对于购买他们迄今尚不了解的鱼来说，可能需要一点鼓励。
Others may need a little encouragement to buy fish hitherto unknown to them.
其他人对于购买他们迄今尚不了解的鱼来说，可能需要一点鼓励。
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