科学素养与生活应用·英语30篇（5）

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沙漠植物为何将水分储存在厚蜡质茎中

Desert plants like cacti evolved thick stems to store water during rare rainfalls.
Their waxy outer layer minimizes evaporation by sealing moisture inside plant tissues.
Stomata open only at night to absorb CO₂ while reducing daytime water loss.
Specialized cells called parenchyma hold large volumes of water without bursting.
The stem’s ribbed structure expands when hydrated and contracts during droughts.
This adaptation lets them survive months without rainfall in arid environments.
Some species store up to 90% of their mass as water in these modified stems.
Unlike leaves, stems perform photosynthesis when leaves are absent or reduced.
Root systems spread widely but shallowly to capture surface runoff quickly.
These traits collectively demonstrate how evolution optimizes survival under extreme scarcity.

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

Specialized cells called parenchyma hold large volumes of water without bursting. 一类名为薄壁组织的特化细胞能大量储水而不破裂。
The stem’s ribbed structure expands when hydrated and contracts during droughts. 茎部的肋状结构在吸水时扩张，干旱时收缩。
This adaptation lets them survive months without rainfall in arid environments. 这种适应性使它们能在干旱环境中数月无雨仍存活。

这篇中文题目最接近哪一句？沙漠植物为何将水分储存在厚蜡质茎中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？仙人掌等沙漠植物演化出粗厚的茎，以在罕见的降雨中储水。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 Desert Plants Store Water in Thick, Waxy Stems How to cook noodles A maths worksheet

Specialized cells called parenchyma hold large volumes of water without bursting.

Specialized cells called parenchyma hold large volumes of water without bursting.

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：Specialized cells called parenchyma hold large volumes of water without bursting.