伤感 (shāng gǎn): sad; emotional; sentimental; pathos

On graduation day, everyone smiled for photos, but when she returned to the dorm to pack her bags, she suddenly felt a wave of sadness.

Hearing this old song, he thought of the summers he spent with his grandmother in childhood, and couldn't help feeling a little sad.

In autumn, fallen leaves covered the path. Walking alone, a feeling of sadness slowly welled up in her heart.

He has been away from his hometown for ten years. Every time he sees his parents' white hair on video calls, he feels a pang of sadness.