Although Lily isn't my biological child, I've always treated her as my goddaughter with great affection.

goddaughter 是由 god（上帝）和 daughter（女儿）组成的复合名词，字面意思是"上帝的女儿"。在基督教文化中，指受洗时由教父母（godparents）负责其宗教教育的女孩，中文对应"教女"的概念。