指尖划过簪子
[zhĭ jiān huà guò zān zi]
It describes the delicate moment when fingertips touch or graze past a hairpin ('簪子'), which is often used by women in traditional China to hold up hair. It carries elegance and subtlety, suggesting a fleeting and gentle touch with some melancholy, as if reminiscing about the classical beauty of an era long gone.