2 sentences

1. 他打着改革的旗号，实际上却在谋取私利。

   tā dǎ zhe gǎi​gé de qí​hào, shí​jì​shàng què zài móu​qǔ sī​lì.

   Under the banner of reform, he is actually seeking personal gain.

   Source: Dong Chinese Dictionary

2. 海军士兵通过挥动手中的小旗发出了旗号。

   hǎi​jūn shì​bīng tōng​guò huī​dòng shǒu zhōng de xiǎo qí fā​chū le qí​hào.

   The sailors signaled by waving small flags.

   Source: Dong Chinese Dictionary