我其实都知道只是不说
[wŏ qí shí dōu zhī dào zhĭ shì bù shuō]
This translates to 'I actually know everything, but just don't say it'. It implies being aware of something, possibly someone’s secrets or true nature, without choosing to confront or disclose them. The person uses this as a way of expressing wisdom or insightfulness while remaining quiet.