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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.(2) Purposeful practice is focused刘邦明显的有些迟疑了，派个亲信之人前去是必然的，但是如果要自己的女人去冒险，他还是很不忍心的。　　这次加菲和主人乔恩（Breckin Meyer 布瑞金•梅耶 饰）远赴英国旅行，一路上它花招不断，主仆俩闹出不少的笑话。巧合的是，伦敦有一只出身名门的猫和加菲长得极其相似，阴差阳错之下它们互换了身份，加菲因此享受了一把它梦寐以求的奢侈而豪华的生活。Chu can also see clearly that the reason is that there are too many of them. Let's describe them this way-it looks like a dark cloud rising out of thin air in the rainforest. "Zhang Xiaobo said.丞相萧何提出了自己的意见。