3 sentences

1. 墙上赫然写着四个大字。

   qiáng shàng hè​rán xiě zhe sì gè dà zì.

   Four large characters were prominently written on the wall.

   Source: Dong Chinese Dictionary

2. 他打开箱子，赫然发现里面是一堆黄金。

   tā dǎ​kāi xiāng​zi, hè​rán fā​xiàn lǐ​miàn shì yī duī huáng​jīn.

   He opened the box and was shocked to find a pile of gold inside.

   Source: Dong Chinese Dictionary

3. 走进办公室，我看见黑板上赫然写着我被录取的通知。

   zǒu​jìn bàn​gōng​shì, wǒ kàn​jiàn hēi​bǎn shàng hè​rán xiě zhe wǒ bèi lù​qǔ de tōng​zhī.

   Entering the office, I saw the notice of my admission written prominently on the blackboard.

   Source: Dong Chinese Dictionary