2 sentences

1. 排队买票的人群在广场上排成了一条龙。

   pái​duì mǎi piào de rén​qún zài guǎng​chǎng shàng pái​chéng le yī​tiáo​lóng.

   The crowd queuing for tickets formed a long line in the square.

   Source: Dong Chinese Dictionary

2. 这家公司为客户提供从研发到销售的一条龙服务。

   zhè jiā gōng​sī wèi kè​hù tí​gōng cóng yán​fā dào xiāo​shòu de yī​tiáo​lóng fú​wù.

   This company provides end-to-end services for customers, from R&D to sales.

   Source: Dong Chinese Dictionary