qīng chén / pēn qì jī / fēi guò / chéng shì / shàng kōng / liú xià / le / cháng cháng / de / bái xiàn

清晨，喷气机飞过城市上空，留下了长长的白线。

In the early morning, a jet flew over the city, leaving a long white trail.