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The Spanish flu was a severe influenza epidemic that spread around the world in 1918. It is one of the largest and most far-reaching influenza epidemics in modern history.At its worst: The Spanish flu, which spread globally between 1918 and 1920, infected about a third of the world's population and killed an estimated 50 million to 100 million people.

During the Spanish flu outbreak in 1918, governments responded to the flu in different ways. Some adopted measures to close public places and restrict the movement of people, while others strengthened the medical system and prevention and control measures.

United Kingdom: The British government also closed public places and restricted the movement of people in 1918, and strengthened the medical system. At the same time, the British government is also encouraging the public to wear masks to limit the spread of the virus.

Germany: The German government strengthened the medical system in 1918 in response to the threat of influenza. At the same time, the German government has also restricted the movement of people and the opening of public places to prevent the spread of the virus.

Reason for Disappearance: According to current research, the disappearance of Spanish flu is mainly due to the improvement of population immunity. As people are exposed to and infected with the virus, their immunity builds up, reducing new infections and deaths.

The Spanish flu had a huge impact on human beings, which inspired the attention to global health events and the strengthening of response capabilities. Therefore, understanding and responding to influenza epidemics is critical to protecting human health.

翻譯:

西班牙流感是1918年流行於全球的一場嚴重的流感流行病，是近代歷史上規模最大、影響最深遠的流感疫情之一。最嚴重的程度：西班牙流感在1918年至1920年間全球範圍內傳播，全球約有1/3的人口感染了該病毒，估計有5000萬至1億人死亡。

1918年的西班牙流感爆發期間，各國政府對流感的應對方式各不相同，有的采取了關閉公共場所和限制人員流動的措施，有的則加強了醫療體系和防控措施。

英國：英國政府在1918年也采取了關閉公共場所和限制人員流動的措施，並加強了醫療體系。同時，英國政府還鼓勵公眾戴口罩，以限制病毒的傳播。

德國：德國政府在1918年加強了醫療體系，以應對流感的威脅。同時，德國政府也限制了人員流動和公共場所的開放，以防止病毒的傳播。

消失原因：目前研究認為西班牙流感消失主要是由於人群免疫力的提高。隨著人們接觸和感染了該病毒，他們的免疫力就會增強，從而減少了新的感染和死亡率。

西班牙流感對人類造成了巨大的影響，啟發了對全球衛生事件的重視和應對能力的加強。因此，了解和應對流感流行病對保護人類健康至關重要。

生物部分:

1.病毒依感染的對象可分三大類：細菌病毒（噬菌 體）、動物病毒及植物病毒。 

2.病毒在宿主體外 時，因缺少代謝作用所需的各種酵素，無法表現生命現象，而是必須在感染 宿主後，利用宿主細胞的資源才能繁殖。在目前的生物分類系統中，生物學 家沒有將病毒列入考量，但是病毒具有遺傳物質，並能隨著時間與環境產生 變異與適應。病毒所產生的致病力會讓生物受害甚至死亡，但是生物也會產 生防禦機制來保護自己，兩者互相形成天擇的選汰作用並演化。