好奇为什么 · 4-8 岁

鱼为什么能在水里呼吸

湿润鳃丝里的交换

科普启蒙约 5 分钟4-8 岁中英双语

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水族馆里，小鱼张嘴又合嘴。乐乐好奇地问：

At the aquarium, a little fish opened and closed its mouth. Lele wondered,

水族馆里，小鱼张嘴又合嘴。乐乐好奇地问：

At the aquarium, a little fish opened and closed its mouth. Lele wondered,

“鱼为什么能在水里呼吸？”妈妈笑着说：“一起看看。”

"Why can fish breathe in water?" Mom smiled. "Let’s find out together."

原来，水里也溶着看不见的氧气。

It turns out that water also holds invisible oxygen dissolved in it.

鱼让水从嘴里进入，再流过鳃。

Fish draw water in through their mouths, and the water flows across their gills.

鳃丝又薄又湿，还布满细小血管，能取走氧气。

The gill filaments are thin, moist, and full of tiny blood vessels that collect oxygen.

氧气进了血液，二氧化碳回到水里。鳃不能干。

Oxygen enters the blood, while carbon dioxide moves back into the water. Gills must stay moist.

乐乐看着水里的鱼：“所以不能把鱼捞出水哦！”

Lele watched the fish and said, "So we must not lift fish out of the water!"

乐乐又问：“那萤火虫为什么会发光？”

Lele asked another question: "Then why do fireflies glow?"

水中溶有氧气，鱼用湿润的鳃从水里取得氧气，并排出二氧化碳。

Water contains oxygen; fish use wet gills to take in oxygen and release carbon dioxide.

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