murky/uncharted waters idiom
陌生的领域；可能会有危险的情况
a situation that is not well known and may be dangerous
In the last two chapters of the book, she enters the murky waters of male sexuality. 在该书的最后两章，她提到了男性性行为这个可能会引起麻烦的话题。
After the Wall Street crash, the American economy moved into uncharted waters. 在华尔街股市暴跌之后，美国经济进入了一个前途未卜的时期。