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Some plants are very picky when choosing pollinators. The flowers of European Trollius are like a real safe deposit box, and only six kinds of insects know the code to open the safe deposit box. These lucky people all come from the genus Brevicorn. Only they know how to get into the sepals of European Trollius and find the center of the flower. However, no matter how hard other insects try, they can only fail with disappointment. The short-horned flower fly, which has gone to great pains to pollinate European Trollius, will naturally receive considerable "remuneration". Female short-horned flower flies lay eggs on the carpels of flowers. When the larvae are hatched, they will eat the seeds of flowers and grow up. This symbiotic relationship also has certain risks for European Trollius. The more short-horned flower flies, the greater the chance of pollination, but at the same time, the more insects parasitic on flowers. The cooperative relationship between the two was formed millions of years ago and continues to this day. It is a model of relative balance and harmonious symbiosis in nature.怪不得……怪不得……这下真的遭天谴了。瞬间的愕然，尹旭心念电转，计上心来，说道：沉鱼落雁呢，是形容女子容貌美丽，天人之姿的词语。杨必归立刻就不干了，撸起袖管要出门。　　讲述卡斯特成为“惩罚者”前是美国海军陆战队的战术狙击手，后因家人被残忍杀害而开始以暴制暴、对抗黑暗势力。能让庞取义那样低头，实是不知道杨长帆厉害到了什么程度。