十万个为什么·科学启蒙30篇（3）

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我在海里游泳时海水是咸的

Rainwater washes minerals like salt from rocks into rivers and then to the sea.
Over millions of years, oceans collected huge amounts of dissolved salt from land.
Salt stays in seawater because it doesn’t evaporate with the water vapor.
Every liter of seawater holds about 35 grams of salt — mostly sodium chloride.
Some places like the Dead Sea have even more salt because water evaporates faster there.
Fish and seaweed live well in salty water thanks to special body adaptations.
When you taste ocean water, your tongue senses salt before anything else.
Desalination plants remove salt to make seawater safe for drinking and cooking.
Ocean currents mix salty water so most areas taste similarly strong.
You’ll feel thirsty after swallowing seawater because your body needs fresh water to balance the salt.

听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。

Ocean currents mix salty water so most areas taste similarly strong. 洋流混合咸水，使多数海域咸度相近。
Salt stays in seawater because it doesn’t evaporate with the water vapor. 盐留在海水中，因为它不会随水蒸气蒸发。
When you taste ocean water, your tongue senses salt before anything else. 尝海水时，舌头最先感受到的是咸味。

这篇中文题目最接近哪一句？我在海里游泳时海水是咸的一次学校运动会的通知一份超市购物清单

课文第一句的意思更接近？雨水将岩石中的盐等矿物质冲入河流，最终汇入大海。今天学校放假了。请把窗户打开。

这一课主要在讲什么？（看英文标题） The Ocean Tastes Salty When I Swim How to cook noodles A maths worksheet

Ocean currents mix salty water so most areas taste similarly strong.

Ocean currents mix salty water so most areas taste similarly strong.

第一版：录下来、回听、再听标准音。系统打分以后再加。

用今天的表达，自己说一句。

例子：Ocean currents mix salty water so most areas taste similarly strong.