正在确认阅读权限…
Why Do Certain Flowers Change Color After Being Pollinated?
为什么某些花朵授粉后会变色？
精读先不看文字，完整听一遍。
-
Many flowers, like morning glories and lantanas, shift from bright blue or purple to pink or brown after successful pollination.许多花卉（如牵牛花和马缨丹）成功授粉后，花色会从鲜亮的蓝色或紫色变为粉色或棕色。
-
This color change signals to bees and butterflies that nectar is gone, saving their energy for more rewarding visits.这种变色向蜜蜂和蝴蝶发出信号：花蜜已耗尽，从而帮它们节省精力，去访问更有回报的花朵。
-
Pigment shifts happen because pollination triggers hormonal changes that alter anthocyanin production in petals.色素变化源于授粉引发激素改变，进而调控花瓣中花青素的合成。
-
UV patterns invisible to humans also fade post-pollination, guiding insects using ultraviolet vision.对人类不可见的紫外线图案也在授粉后逐渐消失，为具备紫外视觉的昆虫提供引导。
-
Some orchids even emit different scents before and after pollination to further manage pollinator traffic.一些兰花甚至在授粉前后释放不同气味，进一步调控传粉者行为。
-
Researchers confirmed this by manually pollinating flowers and observing color shifts within 24 hours under controlled light.研究人员通过人工授粉并在受控光照下观察，证实花朵在24小时内即出现颜色变化。
-
Color-changing blooms improve plant efficiency: they attract pollinators when needed but avoid wasting resources later.变色开花提高了植物效率：需要时吸引传粉者，之后则避免资源浪费。
-
Not all flowers do this—most rely on nectar depletion or petal wilting instead of visual cues.并非所有花卉都如此——多数依赖花蜜耗尽或花瓣萎蔫，而非视觉信号。
-
Genetic studies show that pigment-regulating genes activate only after pollen tubes reach the ovary successfully.基因研究表明，只有当花粉管成功抵达子房后，调控色素的基因才会被激活。
-
This adaptation evolved independently in at least seven plant families, proving its strong survival advantage in competitive ecosystems.这一适应机制至少在七个植物科中独立演化，证明其在竞争激烈的生态系统中具有显著生存优势。
精读 · 大约 10 分钟
听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。
③ 学 · 重点表达
- UV patterns invisible to humans also fade post-pollination, guiding insects using ultraviolet vision. 对人类不可见的紫外线图案也在授粉后逐渐消失，为具备紫外视觉的昆虫提供引导。
- Pigment shifts happen because pollination triggers hormonal changes that alter anthocyanin production in petals. 色素变化源于授粉引发激素改变，进而调控花瓣中花青素的合成。
- Some orchids even emit different scents before and after pollination to further manage pollinator traffic. 一些兰花甚至在授粉前后释放不同气味，进一步调控传粉者行为。
④ 懂 · 选一选
⑤ 今天会说这一句
UV patterns invisible to humans also fade post-pollination, guiding insects using ultraviolet vision.
⑥ 跟读并录音
UV patterns invisible to humans also fade post-pollination, guiding insects using ultraviolet vision.
第一版：录下来、回听、再听标准音。系统打分以后再加。
⑦ 说 · 自己来一句
用今天的表达，自己说一句。
例子：UV patterns invisible to humans also fade post-pollination, guiding insects using ultraviolet vision.
已记下。连续天数以后会显示在课表里。
陈老师指导
课程开发中，敬请期待。成人和孩子都可以先自学听读、精读。
这边的讲解音轨还在做。想先跟着老师走完固定 30 课，可以去陈老师带读社（和自学通行不是同一份会员）。
课程开发中，敬请期待。