zhè / ge / fù / zá / de / jī / qì / xué / xí / xì / tǒng / yóu / duō / gè / zǐ / mó / xíng / gòng / tóng / zǔ / chéng这个复杂的机器学习系统由多个子模型共同组成。This complex machine learning system is composed of multiple submodels working together.