yī / shēng / shuō / tā / tóu / shàng / de / bān / tū / kě / néng / yǔ / miǎn / yì / xì / tǒng / yǒu / guān医生说他头上的斑秃可能与免疫系统有关。The doctor said that the spot baldness on his head might be related to the immune system.