complex diseases的用法和樣例：
例句
- Myocarditis is a complex disease because multiple pathogenetic factors play a role.
摘要心肌炎是一種由多種致病因素所引起的複雜疾病。 - However, he said, understanding the molecular nature of this single genetic defect, which is at the root of a familial form of such a complex disease, offers invaluable clues.
然而，他又說，理解單個遺傳缺陷的分子本質，其是如此複雜疾病的一種家族性形式的根源，提供了無價的線索。
