Bìyè de shíhou, tóngxuémen xīnli dōu chōngmǎn le bùshě.
At graduation, the classmates' hearts were full of sadness at parting.
Tips
usage
不舍 is the written, slightly literary partner of spoken 舍不得. In idioms it can also mean 'not let go, not stop': 依依不舍 (unable to tear oneself away), 锲而不舍 (to keep at it) and 紧追不舍 (to chase without letting up).