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STEM Light Read: Why Desert Plants Bloom Only After Heavy Rains (2026-D005)
STEM轻科普：为何沙漠植物只在暴雨后开花（2026-D005）
精读先不看文字，完整听一遍。
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Some desert plants remain dormant for years until heavy rain triggers rapid flowering.一些沙漠植物可休眠数年，直至强降雨触发其迅速开花。
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Their seeds contain abscisic acid, a hormone that blocks germination until water dilutes it.其种子含有脱落酸——一种抑制萌发的激素，需水分稀释后才失效。
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Rain also washes away soil inhibitors and cools ground temperatures to optimal levels.雨水还能冲走土壤中的萌发抑制物，并将地表温度降至最适水平。
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Within days, ephemerals like desert lilies send up stems, open petals, and attract pollinators.短短数日内，沙漠百合等短命植物便抽出茎秆、绽放花瓣、吸引传粉者。
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Their entire life cycle—from seed to seed—can finish in just three weeks.它们的完整生命周期——从种子到种子——仅需三周即可完成。
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This strategy avoids competition with deep-rooted perennials and conserves scarce water resources.这种策略避开了与深根多年生植物的竞争，也节约了稀缺的水资源。
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Scientists study their gene switches to engineer drought-resilient crops for arid regions.科学家正研究其基因开关，以培育适应干旱地区的抗旱作物。
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Satellite sensors now track bloom events to model climate-driven shifts in desert ecology.卫星传感器如今可追踪花期事件，用以模拟气候变化对沙漠生态的影响。
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Unlike garden flowers, these species lack nectar rewards but rely on visual contrast in barren landscapes.与园艺花卉不同，这些物种不分泌花蜜，仅依靠荒芜背景中的鲜明视觉对比吸引传粉者。
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Their brief brilliance reminds us how tightly biology links to environmental signals.它们转瞬即逝的绚烂，提醒我们生物节律与环境信号紧密相连。
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
- Their entire life cycle—from seed to seed—can finish in just three weeks. 它们的完整生命周期——从种子到种子——仅需三周即可完成。
- This strategy avoids competition with deep-rooted perennials and conserves scarce water resources. 这种策略避开了与深根多年生植物的竞争，也节约了稀缺的水资源。
- Scientists study their gene switches to engineer drought-resilient crops for arid regions. 科学家正研究其基因开关，以培育适应干旱地区的抗旱作物。
④ 懂 · 选一选
⑤ 今天会说这一句
Their entire life cycle—from seed to seed—can finish in just three weeks.
⑥ 跟读并录音
Their entire life cycle—from seed to seed—can finish in just three weeks.
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：Their entire life cycle—from seed to seed—can finish in just three weeks.
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。