2 sentences

1. 他听了这话，在那儿怔了半天。

   tā tīng le zhè huà, zài nà​r zhèng le bàn​tiān.

   Hearing this, he stood there dazed for a long time.

   Source: Dong Chinese Dictionary

2. 由于过度惊吓，他这几天总是感到心神怔忡。

   yóu​yú guò​dù jīng​xià, tā zhè jǐ tiān zǒng​shì gǎn​dào xīn​shén zhēng chōng.

   Due to excessive shock, he has been experiencing heart palpitations lately.

   Source: Dong Chinese Dictionary