Zìbìzhèng shì yí ge pǔxì, bùtóng háizi de biǎoxiàn chābié hěn dà.
Autism is a spectrum, and it shows very differently in different children.
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谱系 first meant a family tree or line of descent, and biology uses it for the lineage of species. Medicine borrowed it for 'spectrum': 自闭症谱系障碍 is autism spectrum disorder, often shortened to 自闭谱系.
