3 sentences

1. 几片落叶在水面上静静地浮动。

   jǐ piàn luò​yè zài shuǐ​miàn shàng jìng​jìng de fú​dòng.

   A few fallen leaves were floating quietly on the water's surface.

   Source: Dong Chinese Dictionary

2. 该国目前实行的是浮动汇率制度。

   gāi guó mù​qián shí​xíng de shì fú​dòng huì​lǜ zhì​dù.

   The country currently implements a floating exchange rate system.

   Source: Dong Chinese Dictionary

3. 由于供需关系的变化，市场价格在一定范围内浮动。

   yóu​yú gōng​xū guān​xi de biàn​huà, shì​chǎng jià​gé zài yī​dìng fàn​wéi nèi fú​dòng.

   Market prices fluctuate within a certain range due to changes in supply and demand.

   Source: Dong Chinese Dictionary