2 sentences

1. 旅游团坐大巴去长城。

   lǚ​yóu​tuán zuò dà​bā qù Cháng​chéng.

   The tour group is taking a bus to the Great Wall.

   Source: Dong Chinese Dictionary

2. 为了安全起见，请在大巴上系好安全带。

   wèi​le ān​quán qǐ​jiàn, qǐng zài dà​bā shàng jì hǎo ān​quán​dài.

   To be on the safe side, please fasten your seatbelt on the bus.

   Source: Dong Chinese Dictionary