Natatou said Niger and other sub-Saharan African countries are currently at war, which adds to the current educational system problems.

纳塔图说，尼日尔和其他撒哈拉以南非洲国家目前正处于战争状态，这给目前的教育系统带来更多问题。

It's also been linked to chronic pain, immune system problems, heart disease, and hormone imbalances.

它还与慢性疼痛、 免疫系统问题、 心脏病和激素失衡有关。

Common symptoms of COVID-19 include shortness of breath which is difficulty breathing, coughing, fever, loss of sense of smell, chills, and digestive system problems like nausea, vomiting or diarrhea.

COVID-19的常见症状包括呼吸急促（即呼吸困难）、咳嗽、发烧、失去嗅觉、发冷，还有类似恶心、呕吐或腹泻等消化系统问题。