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风滚草如何在干旱土地上传播种子？

Tumbleweeds are whole plants that break free from their roots when dry and roll with the wind.
Their round, spiny shape helps them bounce over rough terrain without getting stuck easily.
As they tumble, thousands of tiny seeds shake loose from special compartments inside the dried branches.
These seeds have tough outer coats that let them survive long journeys across deserts and plains.
Wind speed, terrain slope, and rainfall patterns all influence how far a tumbleweed travels before stopping.
Once it lands in moist soil, the plant’s remaining seeds may germinate when spring rains arrive.
Some tumbleweeds spread invasive species, while others help native grasslands recover after fire.
Unlike most plants, tumbleweeds don’t rely on animals or water—they use pure physics to disperse life.
Botanists study their movement to improve models of seed dispersal in arid ecosystems.
This clever survival strategy shows how evolution shapes motion into a tool for reproduction.

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

Some tumbleweeds spread invasive species, while others help native grasslands recover after fire. 有些风滚草传播入侵物种，另一些则助力火灾后的本土草原恢复。
Botanists study their movement to improve models of seed dispersal in arid ecosystems. 植物学家研究其运动方式，以优化干旱生态系统中的种子扩散模型。
Their round, spiny shape helps them bounce over rough terrain without getting stuck easily. 它们圆润带刺的外形使其能轻松跃过崎岖地形而不易卡住。

这篇中文题目最接近哪一句？风滚草如何在干旱土地上传播种子？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？风滚草是整株植物，干燥后会脱离根系，随风滚动。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） How Do Tumbleweeds Spread Seeds Across Dry Land? How to cook noodles A maths worksheet

Some tumbleweeds spread invasive species, while others help native grasslands recover after fire.

Some tumbleweeds spread invasive species, while others help native grasslands recover after fire.

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：Some tumbleweeds spread invasive species, while others help native grasslands recover after fire.