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.
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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.
