It's still uncertain whether the College Spring Sports will be held this year.
学院今年的春运会是否开还是个未知数.
《现代汉英综合大词典》
The future is so uncertain that one man's guess is as good as another's.
未来的事情很难臆测,大家都心中无数.
《现代汉英综合大词典》
Englishmen themselves, let alone foreigners, are often uncertain what is slang and what isn't.
英国人自己也常常不能确定什么是俚语, 更不要说外国人了.
网络期刊摘选
How far the republics can give practical help, however, is uncertain...
然而,这些共和国究竟能够提供多少切实可行的帮助还未可知。
柯林斯高阶英语词典