3 sentences

1. 轮船将于明天准时启航。

   lún​chuán jiāng yú míng​tiān zhǔn​shí qǐ​háng.

   The ship will set sail on time tomorrow.

   Source: Dong Chinese Dictionary

2. 舰长下达了启航的命令。

   jiàn​zhǎng xià​dá le qǐ​háng de mìng​lìng.

   The captain issued the order to set sail.

   Source: Dong Chinese Dictionary

3. 船长拉响了汽笛，示意轮船即将启航。

   chuán​zhǎng lā​xiǎng le qì​dí, shì​yì lún​chuán jí​jiāng qǐ​háng.

   The captain sounded the whistle, signaling that the ship was about to set sail.

   Source: Dong Chinese Dictionary