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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.1941年日本人肆虐中原，与汪伪政府狼狈为奸疯狂杀害共产党人，我党损失无法估量。为完成民族解放大业，共产党人毅然在硝烟四起的战场予以敌人迎头痛击。同时建立起发达的地下网络截取敌人情报、消灭反动人员。这些英勇的地下人员就像一道汹涌的暗流推动着抗战胜利的进程。Now let's look at the PLA cigarette oil filter, which is especially like plastic paper. This thing does look like plastic, but it is actually PLA, or polylactic acid. Someone once misunderstood that this thing was plastic, and then wondered how harmful it would be if the plastic was heated during smoking. In fact, this is a complete misunderstanding, because it is not plastic at all.也不知咋了，我跟你们跑散了，还被人掐住脖子。Chapter IV Fire Protection Technical Service Activities都老五了啊……汪滶的婚事，以及他口中的老五问题，始终是徽王府避不开又搞不定的麻烦。"Hello everyone, this is the first qualifying match for the primary election of the Dream of Red Mansions League. It is very rare. Today we see someone challenging hell again..." When the anchorwoman's cheerful and excited voice sounded...