牛津电影里 100%
谁也拿不准;谁也说不清;很难说
you can never be sure, for example because things are not always what they appear to be
My next is very conventional, l'm afraid, but you can never tell how these things will turn out.
You can never tell with chillies.
释义来自《牛津高阶英汉双解词典》第 9 版