Báixìbāo shì miǎnyì xìtǒng de zhòngyào zǔchéng bùfen.
White blood cells are an important part of the immune system.
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白 (white) + 细胞 (cell) - literally 'white cell'. The counterpart is 红细胞 (hóngxìbāo, red blood cell). Chinese medical terms are often beautifully literal.
