Why Do Some Cacti Flower Only at Night—and Release Strong Fragrance After Sunset?
为什么一些仙人掌只在夜间开花，并在日落后释放浓烈香气？
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Nocturnal cacti like the night-blooming cereus open their large white flowers after dusk.
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They rely on moths and bats—not bees or birds—for pollination during darkness.
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