2 sentences

1. 他们买了一张单程票。

   tā​men mǎi le yī zhāng dān​chéng piào.

   They bought a one-way ticket.

   Source: OpenSubtitles

2. 我只买了一张去上海的单程票。

   wǒ zhǐ mǎi le yī zhāng qù Shàng​hǎi de dān​chéng piào.

   I only bought a one-way ticket to Shanghai.

   Source: Dong Chinese Dictionary