科学为什么·英语30篇（1）

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为什么有些树整个冬天都长着叶子？

Evergreen trees like pines and hollies retain leaves year-round thanks to special adaptations, not because they ignore seasons.
Their needle-like or waxy-coated leaves lose water much more slowly than broad deciduous leaves do.
A thick cuticle layer and sunken stomata reduce moisture loss during cold, dry winter winds.
These leaves also contain antifreeze compounds that prevent ice crystals from rupturing their cells.
While deciduous trees drop leaves to conserve water and energy, evergreens keep photosynthesis going—even slowly—in mild spells.
Older evergreen leaves gradually yellow and fall, but new ones grow steadily, maintaining green coverage.
This strategy works best where winters are short or soil stays unfrozen long enough for root uptake.
In contrast, tropical evergreens face no frost risk, so leaf retention serves different ecological goals.

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These leaves also contain antifreeze compounds that prevent ice crystals from rupturing their cells. 这些叶片还含有抗冻物质，防止冰晶刺破细胞。
Their needle-like or waxy-coated leaves lose water much more slowly than broad deciduous leaves do. 它们针状或蜡质涂层的叶片比宽大的落叶树叶片失水慢得多。
A thick cuticle layer and sunken stomata reduce moisture loss during cold, dry winter winds. 厚厚的角质层和下陷的气孔可减少寒冷干燥冬季大风造成的水分流失。

这篇中文题目最接近哪一句？为什么有些树整个冬天都长着叶子？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？松树、冬青等常绿树全年保持叶片，靠的是特殊适应机制，而非无视季节变化。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 Keep Their Leaves All Winter? How to cook noodles A maths worksheet

These leaves also contain antifreeze compounds that prevent ice crystals from rupturing their cells.

These leaves also contain antifreeze compounds that prevent ice crystals from rupturing their cells.

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：These leaves also contain antifreeze compounds that prevent ice crystals from rupturing their cells.