xī / yáng / xià / mù / tóng / dí / shēng / yōu / yáng / chuán / biàn / le / zhěng / gè / shān / gǔ

夕阳下，牧童笛声悠扬，传遍了整个山谷。

At sunset, the shepherd boy's recorder music echoed throughout the valley.