4 sentences

1. 他引弓射箭，正中红心。

   tā yǐn gōng shè​jiàn, zhèng​zhōng hóng​xīn.

   He drew his bow and fired an arrow, hitting the bullseye.

   Source: Dong Chinese Dictionary

2. 广场的正中立着一根高大的旗杆。

   guǎng​chǎng de zhèng​zhōng lì zhe yī gēn gāo​dà de qí​gān.

   A tall flagpole stands right in the center of the square.

   Source: Dong Chinese Dictionary

3. 这一刀正中心脏，是导致他死亡的致命伤。

   zhè yī dāo zhèng​zhōng xīn​zàng, shì dǎo​zhì tā sǐ​wáng de zhì​mìng​shāng.

   The stab went straight to the heart and was the fatal wound that caused his death.

   Source: Dong Chinese Dictionary

4. 他的分析正中要害，指出了计划中最大的问题。

   tā de fēn​xī zhèng​zhōng yào​hài, zhǐ​chū le jì​huà zhōng zuì dà de wèn​tí.

   His analysis hit the nail on the head, identifying the biggest problem with the plan.

   Source: Dong Chinese Dictionary