n.未知事件（unknown的复数）
navigating the unknown───探索未知世界
unknown market wizards───不知名的市场奇才
unknown future───未知的未来
unknown song───未知歌曲
into the unknown lyrics───进入未知的歌词
explorations unknown───未知的探索
unknown location───未知位置
player unknown battlegrounds───玩家未知战场
unknowable───adj.不可知的；不能知道的
unknown soldier───n.阵亡的无名英雄；（美）阵亡的无名英雄
length of the war is one of the biggest unknowns.───战争的持续时间是其中一个最大的未知数。
X and Y in the equation are both unknowns.───等式中的X和Y都是未知数。
so many unknowns in the proposal.───这项提案中的未知数太多了。
Objective uncertainty is about what Donald Rumsfeld (in a different context) referred to as the "known unknowns" .───客观的不确定性关乎唐纳德拉姆斯菲尔德（在另一种语境中）提及的“已知的未知方面”。
One of the great unknowns about EVs is what sort of charging infrastructure will emerge.───关于电动汽车最大的未卜前程就是充电基础设施的短缺将显现。
Unless they are documented and signed off, the project itself might have quite a few unknowns at the very onset.───除非将其形成文档，并最终签署确定，否则刚一开始项目本身就可能有很多未知的地方。
But he cautions that there are still many unknowns: "I find it a bit of a stretch to talk about what will happen in one year. "───但是他警告说，还有许多东西是未知的：“我发现谈论一年后将要发生的事情有点言过其实。”
With so many unknowns, it's easy to let one's imagination "filling the blanks. "───这么多的未知数很容易让一个人的想象力“填入答案”。
We could attempt to get around this difficulty by initially assigning the arbitrary value to another of the unknowns rather than to Xn.───开头对另一个而不是Xn的未知数指定为任意常数，能试图避免这个困难。
We fear the unknowns , so we reduce to terms that are most familiar to us, whether that's a folk tale, a disease, or... a conspiracy.
It's the big unknowns that make insurance companies uneasy.
The unknowns in the equations are the values of the dependent variables at the node.
Danger of deficits Opponents argue several other unknowns could send the state into a deficit tailspin.
The unknowns in the above equation are referred to the local numbering system.
There are so many unknowns in the proposal.
Unknowns about recovery time and hospital procedures make matters worse.
There are many unknowns in science.
x and y are unknowns.