十万个为什么·科学阅读30篇（2）

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为什么有些树只在春天落叶，而不是秋天？

Most deciduous trees lose leaves in autumn to conserve water during cold winters.
But certain species like the Indian coral tree drop old leaves only in early spring.
This timing helps them avoid drought stress while preparing for new growth simultaneously.
Their leaf-shedding is triggered by rising temperatures and longer daylight hours, not cold.
Scientists found that specialized hormones respond to photoperiod cues more strongly than temperature here.
The process allows rapid flowering before new leaves block sunlight from blossoms.
Roots remain active year-round, storing energy for synchronized leaf and flower emergence.
Unlike temperate trees, these species evolved in tropical climates with distinct wet-dry cycles.
Botanists use this trait to study how climate change affects seasonal plant behavior.
Researchers monitor leaf-fall patterns across decades to track ecosystem adaptation rates.

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

Researchers monitor leaf-fall patterns across decades to track ecosystem adaptation rates. 研究人员通过数十年监测落叶模式，追踪生态系统的适应速率。
The process allows rapid flowering before new leaves block sunlight from blossoms. 该过程使树木能在新叶遮挡阳光前快速开花。
Roots remain active year-round, storing energy for synchronized leaf and flower emergence. 根系全年保持活跃，储存能量以协调新叶与花朵同步萌发。

这篇中文题目最接近哪一句？为什么有些树只在春天落叶，而不是秋天？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？多数落叶树在秋季落叶，以在寒冷冬季节约水分。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） Why Do Some Trees Shed Leaves Only in Spring — Not Autumn? How to cook noodles A maths worksheet

Researchers monitor leaf-fall patterns across decades to track ecosystem adaptation rates.

Researchers monitor leaf-fall patterns across decades to track ecosystem adaptation rates.

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：Researchers monitor leaf-fall patterns across decades to track ecosystem adaptation rates.