unknown to的用法和樣例：
例句
- The future is always unknown to us.
我們難以預卜未來(lái)。 - Just where she kept in Boston is unknown to history.
她在波士頓到底住在什麼地方，歷史上無(wú)人知曉。 - It is a pity that a man of your ability shall remain unknown to the world.
象你這樣有能力的人不能聞名于世界，真是可惜。 - Quite unknown to me, she'd gone ahead and booked the holiday.
在我完全不了解的情況下，她已先行辦好了度假的預訂手續。
