there's no knowing/telling/saying If you say there's no knowing, you mean it is impossible to be certain about something. 无从知晓;难以预料 She's very unpredictable, so there's no knowing how she'll react to the news. 她这个人很难预料，所以不知道她会对这个消息作何反应。 There's no saying what they might be capable of achieving. 他们能取得什么样的成就是很难说的。