severe diseases

• 重症疾病

severe diseases的用法和样例：

例句

1. If you only have mild flu symptoms and you're not at high risk of severe disease, you don't need medical attention unless your illness worsens.
   如果你只有轻微的感冒症状，你不是重症疾病的高风险群，你不需要医疗照顾，除非您的病情恶化。