3 sentences

1. 中国正努力建设成为现代化强国。

   Zhōng​guó zhèng nǔ​lì jiàn​shè chéng​wéi xiàn​dài​huà qiáng​guó.

   China is striving to build itself into a modern, powerful nation.

   Source: Dong Chinese Dictionary

2. 战国七雄是指战国时期的七个强国。

   Zhàn​guó qī xióng shì zhǐ Zhàn​guó shí​qī de qī gè qiáng​guó.

   The 'Seven Hegemons' refers to the seven powerful states of the Warring States period.

   Source: Dong Chinese Dictionary

3. 他在网络上经常用“强国”一词来讽刺某些社会现象。

   tā zài Wǎng​luò shàng jīng​cháng yòng“ Qiáng​guó” yī cí lái fěng​cì mǒu​xiē shè​huì xiàn​xiàng.

   He often uses the word 'Qiangguo' online to satirize certain social phenomena.

   Source: Dong Chinese Dictionary