发烧和头痛是流感的常见症状。

Fever and headache are common ___symptoms of the flu.

恶心是食物中毒的典型症状。

Nausea is a typical ___symptom of food poisoning.

怀孕的早期症状可能包括疲劳和恶心。

Early ___symptoms of pregnancy can include fatigue and nausea.