2 sentences

1. 他打着学术交流的幌子，到处游山玩水。

   tā dǎ zhe xué​shù jiāo​liú de huǎng​zi, dào​chù yóu​shān​wán​shuǐ.

   Under the guise of academic exchange, he traveled everywhere for pleasure.

   Source: Dong Chinese Dictionary

2. 旧时的酒馆门口常常挂着旗帜作为幌子。

   jiù​shí de jiǔ​guǎn mén​kǒu cháng​cháng guà zhe qí​zhì zuò​wéi huǎng​zi.

   In the old days, taverns often hung banners as signs.

   Source: Dong Chinese Dictionary