所知道的不是那么回事;所掌握的情况大不一样(或大相径庭)
know different / otherwise
所知道的不是那么回事;所掌握的情况大不一样(或大相径庭)
to have information or evidence that the opposite is true
He says he doesn't care about what the critics write, but I know different.他说他并不在乎批评家的评论,可我知道不是那么回事。
释义来自《牛津高阶英汉双解词典》第 9 版