2 sentences

1. 永乐时期，明朝的国力达到了鼎盛。

   Yǒng​lè shí​qī, Míng​cháo de guó​lì dá​dào le dǐng​shèng.

   During the Yongle period, the power of the Ming Dynasty reached its peak.

   Source: Dong Chinese Dictionary

2. 商是中国青铜文明发展的鼎盛时期。

   Shāng shì Zhōng​guó qīng​tóng wén​míng fā​zhǎn de dǐng​shèng shí​qī.

   The Shang Dynasty was the peak of China's bronze civilization.

   Source: Dong Chinese Dictionary