Thinking of writing: Simplify task language directly. In narration, direct narration should be changed into indirect narration, and the language of characters should be simplified as much as possible. In this way, even if the plot is coherent, the sentence is "concise".

In the exhibition hall of the Chinese History Museum in Beijing, there is a restored model of the first seismograph. The inventor was Zhang Heng, a famous scientist in the Eastern Han Dynasty. At132 a.

In 400 AD, in Luoyang, the then capital, Zhang Heng made an ancient seismograph to determine the direction of the earthquake. It is made of copper and looks like a big cup with a lid. Eight dragons are cast on the surface of the instrument, and a copper ball is held in each dragon mouth.

On the ground below the dragon, eight copper toads looked up and opened their mouths opposite Longkou. People respect Zhang Heng, a great scientist, and often hold commemorative activities to show their respect for him. A crater on the moon was named after him.

In the exhibition hall of China History Museum, the restoration model of the first seismograph is displayed. The inventor was Zhang Heng, a famous scientist in the Eastern Han Dynasty. In A.D. 132, in Luoyang, the then capital, Zhang Heng invented the ancient seismograph to identify the direction of the earthquake. The seismograph is made of pure copper and looks like a big cup with a lid.

Eight dragons are cast on its surface, and each dragon mouth has a copper bead. Under every dragon, there is a copper toad, and its mouth is facing the dragon's mouth. People respect the great scientist Zhang Heng, and often hold commemorative activities to express their respect for Zhang Heng. A crater on the moon was named after Zhang Heng.