2 sentences for 巡航 (xún​háng — patrol)

1. 海军舰艇正在领海进行例行巡航。

   hǎi​jūn jiàn​tǐng zhèng​zài lǐng​hǎi jìn​xíng lì​xíng xún​háng.

   Naval vessels are conducting routine patrols in territorial waters.

   Source: Dong Chinese Dictionary

2. 这艘强大的战舰正在公海上执行巡航任务。

   zhè sōu qiáng​dà de zhàn​jiàn zhèng​zài gōng​hǎi shàng zhí​xíng xún​háng rèn​wu.

   This powerful warship is carrying out a patrol mission on the high seas.

   Source: Dong Chinese Dictionary