HSK 3
Yīshēng jiǎnchá le tā de xuèxìbāo shùliàng.
The doctor checked his blood cell count.
HSK 6
Hóng xuèxìbāo fùzé yùnshū yǎngqì.
Red blood cells are responsible for transporting oxygen.
HSK 7-9
Bái xuèxìbāo zài miǎnyì xìtǒng zhōng qǐ zhe zhòngyào zuòyòng.
White blood cells play an important role in the immune system.
