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汪滶这一次竟顶撞了杨长帆：我不为难他，只需要他回答我的问题Flowers not only attract pollinators with color and smell, but also quietly guide insects who are too shy to know what to do because they land on flowers for the first time. There will be a white route on the petals of grassland geranium to guide insects into the center of flowers and find nectar. In this process, the wings of insects will be more or less glued with precious pollen of stamens. The flowers of alpine Pulsatilla and strawberry flowers have white petals on the outside and yellow stamens in the middle. This change in color depth will highlight the stamens and allow insects to fly to the middle of the flowers without hesitation.Suggest refinement说得好。In the "Video Learning" section, there are the first video, short video, simulcast channel, theory, party history, massive open online course, characters, culture, literature and art, science, nature, TV series, movies, rule of law, military and other channels. Among them, the "first video" is mainly a video report on the relevant activities of General Secretary Xi Jinping. As its name implies, "simulcast channel" is CCTV news simulcast video. Massive open online course is a free public video course with a variety of courses.124. X.X.2Article 20 Scope of Application