2 sentences

1. 在那个时代，无数年轻人投身于改革开放的大潮中。

   zài nà gè shí​dài, wú​shù nián​qīng​rén tóu​shēn yú gǎi​gé​kāi​fàng de dà​cháo zhōng.

   In that era, countless young people threw themselves into the tide of reform and opening up.

   Source: Dong Chinese Dictionary

2. 每年秋天，成千上万的游客聚集在这里观看钱塘江大潮。

   měi nián qiū​tiān, chéng​qiān​shàng​wàn de yóu​kè jù​jí zài zhè​lǐ guān​kàn Qián​táng Jiāng dà​cháo.

   Every autumn, thousands of tourists gather here to watch the Qiantang River tidal bore.

   Source: Dong Chinese Dictionary