Huǒchē kāidòng le, tā hái yīyī de xiàng wǒmen huīshǒu.
The train was already moving, but she kept waving to us, reluctant to let go.
Tips
history
From the Book of Songs: 昔我往矣,杨柳依依, 'when I set out, the willows swayed'. Because 柳 'willow' sounds like 留 'to stay', people broke off a willow twig for a friend who was leaving, and the swaying branches came to mean not wanting to part, as in 依依不舍.