How do mermaids （美人魚）swim? Mermaids have a swimming motion like a dolphin. Both mermaids and dolphins have a large single fin （鰭） at the end of their tail that is used to propel （推動）them through the water. They move their large tail fin up and down in the water with a full-body wave motion to create momentum （衝力；推動力） and speed. What is a mermaid? A ...Read More
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