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The first known vessels date back about 10,000 years ago, but could not be described as ships. The first navigators began to use animal skins or woven fabrics as sails. Affixed to the top of a pole set upright in a boat, these sails gave early ships range...

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(翻攝自youtube) 老鼠體內寄生蟲以及傳染病: 鼠體外寄生蟲,如蚤、蜱、滿等; 鼠帶有病原體的排泄物或口水,污染水源或食物致病,或經空氣吸入 鼠咬傷人體所致 (如細菌性傷口發炎) 常見的鼠傳疾病 鼠疫 (plague) 鼠疫又叫「黑死病」,是一種可以致命的疫症,經受感染的黑鼠跳蚤咬人而傳播。...

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