HSK 4
Kēxuéjiā zhèngzài yánjiū rúhé bǎohù shénjīngxìbāo.
Scientists are studying how to protect nerve cells.
HSK 7-9
Réntǐ dànǎo zhōng yuē yǒu bābǎiliùshí yì gè shénjīngxìbāo.
The human brain has approximately 86 billion nerve cells.
HSK 7-9
Shénjīngxìbāo sǔnshāng hòu hěn nán zàishēng.
Nerve cells are difficult to regenerate after damage.
