Daily Chinese Idiom Guessing Game
It is easy to imagine or understand something without needing to be told explicitly.
不用说明就能想象得到。
宋·王楙《野客丛书》而郊以吟诗废务，上官差官以摄其职，分其半禄，酸寒之壮，可想而知。”
Given how much he studied, his good grades were quite predictable.